{"id":6849,"date":"2025-05-31T12:01:00","date_gmt":"2025-05-31T04:01:00","guid":{"rendered":"https:\/\/kabolux.com\/?p=6849"},"modified":"2025-05-26T18:18:55","modified_gmt":"2025-05-26T10:18:55","slug":"ul94-flame-retardant-rating-comparison-table","status":"publish","type":"post","link":"https:\/\/kabolux.com\/es\/ul94-flame-retardant-rating-comparison-table\/","title":{"rendered":"UL94 Flame Retardant Rating Comparison Table"},"content":{"rendered":"<h2 class=\"wp-block-heading\" id=\"h-ul94-flame-retardant-rating-comparison-table\" style=\"font-size:48px\">UL94 Flame Retardant Rating Comparison Table<\/h2><div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"2560\" height=\"1707\" src=\"https:\/\/kabolux.com\/wp-content\/uploads\/2025\/05\/john-barkiple-l090uFWoPaI-unsplash-scaled.jpg\" alt=\"\" class=\"wp-image-6381\" srcset=\"https:\/\/kabolux.com\/wp-content\/uploads\/2025\/05\/john-barkiple-l090uFWoPaI-unsplash-scaled.jpg 2560w, https:\/\/kabolux.com\/wp-content\/uploads\/2025\/05\/john-barkiple-l090uFWoPaI-unsplash-1024x683.jpg 1024w, https:\/\/kabolux.com\/wp-content\/uploads\/2025\/05\/john-barkiple-l090uFWoPaI-unsplash-768x512.jpg 768w, https:\/\/kabolux.com\/wp-content\/uploads\/2025\/05\/john-barkiple-l090uFWoPaI-unsplash-1536x1024.jpg 1536w, https:\/\/kabolux.com\/wp-content\/uploads\/2025\/05\/john-barkiple-l090uFWoPaI-unsplash-2048x1365.jpg 2048w, https:\/\/kabolux.com\/wp-content\/uploads\/2025\/05\/john-barkiple-l090uFWoPaI-unsplash-600x400.jpg 600w\" sizes=\"(max-width: 2560px) 100vw, 2560px\" \/><\/figure><div style=\"height:80px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><div class=\"has-link-color has-text-color has-luminous-vivid-orange-color wp-block-post-date wp-elements-928aeebb4135cd950929cd559aa1f634\"><time datetime=\"2025-05-31T12:01:00+08:00\">2025 \u5e74 5 \u6708 31 \u65e5<\/time><\/div><div style=\"height:70px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><div class=\"wp-block-yoast-seo-table-of-contents yoast-table-of-contents\"><h5>Table of contents<\/h5><ul><li><a href=\"#h-ul94-flame-retardant-rating-comparison-table\" data-level=\"2\">UL94 Flame Retardant Rating Comparison Table<\/a><ul><li><a href=\"#h-1-hb-horizontal-burning-test\" data-level=\"3\">1. HB (Horizontal Burning Test)<\/a><\/li><li><a href=\"#h-2-v-0-vertical-burning-test\" data-level=\"3\">2. V-0 (Vertical Burning Test)<\/a><\/li><li><a href=\"#h-3-v-1-vertical-burning-test\" data-level=\"3\">3. V-1 (Vertical Burning Test)<\/a><\/li><li><a href=\"#h-4-v-2-vertical-burning-test\" data-level=\"3\">4. V-2 (Vertical Burning Test)<\/a><\/li><li><a href=\"#h-5-5va-5vb-vertical-burning-test\" data-level=\"3\">5. 5VA\/5VB (Vertical Burning Test)<\/a><\/li><li><a href=\"#h-6-vtm-series-thin-film-materials\" data-level=\"3\">6. VTM Series (Thin Film Materials)<\/a><\/li><li><a href=\"#h-7-hf-series-foamed-materials\" data-level=\"3\">7. HF Series (Foamed Materials)<\/a><\/li><li><a href=\"#h-summary-table-of-ul94-flammability-ratings\" data-level=\"3\">Summary Table of UL94 Flammability Ratings<\/a><\/li><\/ul><\/li><\/ul><\/div><div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h3 class=\"wp-block-heading\" id=\"h-1-hb-horizontal-burning-test\" style=\"font-size:36px\">1. HB (Horizontal Burning Test)<\/h3><div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"600\" height=\"462\" src=\"https:\/\/kabolux.com\/wp-content\/uploads\/2025\/05\/v2-34cd41be54568157dfb44c17e0fe9cd7_b.jpg\" alt=\"\" class=\"wp-image-6947\"\/><\/figure><div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading\" id=\"h-definition-and-rating-classification\" style=\"font-size:28px\">Definition and Rating Classification<\/h4><div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h6 class=\"wp-block-heading\" id=\"h-hb-horizontal-burning-is-the-lowest-flame-retardant-rating-in-the-ul94-standard-suitable-for-scenarios-with-minimal-fire-safety-requirements-materials-with-this-rating-may-burn-slowly-after-flame-removal-but-exhibit-self-extinguishing-properties-or-controlled-burn-rates\" style=\"font-size:14px\"><strong>HB (Horizontal Burning) is the lowest flame retardant rating in the UL94 standard, suitable for scenarios with minimal fire safety requirements. Materials with this rating may burn slowly after flame removal but exhibit self-extinguishing properties or controlled burn rates.<\/strong><\/h6><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-017217647591c504dd57e0650075e8e1\" id=\"h-test-conditions\" style=\"font-size:28px\">Test Conditions<\/h4><div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-ast-global-color-2-color has-text-color has-link-color wp-elements-4169c87ea1f97b5d19e821d51c82e21c\" id=\"h-sample-requirements\" style=\"font-size:20px\">Sample Requirements<\/h4><div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li><strong>Dimensions<\/strong>: Typically strip-shaped samples placed horizontally, sized\u00a0<strong>125mm\u00d713mm\u00d7thickness<\/strong>\u00a0(thickness range: 1.6mm\u201312.7mm). Some tests require samples of varying thicknesses for consistency verification.<\/li>\n\n<li><strong>Preconditioning<\/strong>:<ul><li>Stored for at least 48 hours at\u00a0<strong>23\u00b12\u2103, 50\u00b15% humidity<\/strong>;<\/li>\n\n<li>Some tests require additional aging at\u00a0<strong>70\u2103<\/strong>\u00a0for 7 days, followed by 4 hours of cooling.<\/li><\/ul><\/li><\/ul><div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-ast-global-color-2-color has-text-color has-link-color wp-elements-02fa2c53d09f3bd5358f8b52bd2e2dfd\" id=\"h-flame-parameters\" style=\"font-size:20px\">Flame Parameters<\/h4><div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li>A\u00a0<strong>20mm<\/strong>\u00a0blue flame applied at a\u00a0<strong>45\u00b0 angle<\/strong>\u00a0to the sample&#8217;s free end;<\/li>\n\n<li><strong>Flame Application Time<\/strong>: 30 seconds (terminated early if the flame front does not reach the 25mm mark).<\/li><\/ul><div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-ast-global-color-2-color has-text-color has-link-color wp-elements-6fdf348c194eaa3dead5f42aceefb68d\" id=\"h-marking-and-timing\" style=\"font-size:20px\">Marking and Timing<\/h4><div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li><strong>25mm<\/strong>\u00a0and\u00a0<strong>100mm<\/strong>\u00a0reference lines are marked on the sample to record burn time between these points (or the distance at which burning stops).<\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-e336649d1b0bab8578a06e4fa8323edb\" id=\"h-evaluation-criteria\" style=\"font-size:28px\">Evaluation Criteria<\/h4><div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h6 class=\"wp-block-heading has-ast-global-color-2-color has-text-color has-link-color wp-elements-caa484f9e9ddd45b4b6877146ec9be8e\" id=\"h-hb-rating-is-determined-based-on-burn-rate-and-self-extinguishing-behavior-categorized-as-follows\" style=\"font-size:14px\">HB rating is determined based on burn rate and self-extinguishing behavior, categorized as follows:<\/h6><div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-ast-global-color-2-color has-text-color has-link-color wp-elements-849730d60d75d5ba6b5697e84cfd4da8\" id=\"h-burn-rate-limits\" style=\"font-size:20px\">Burn Rate Limits:<\/h4><div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li><strong>Thickness 3\u201313mm<\/strong>: Burn rate \u226440mm\/min (<strong>HB40 grade<\/strong>);<\/li>\n\n<li><strong>Thickness &lt;3mm<\/strong>: Burn rate \u226475mm\/min (<strong>HB75 grade<\/strong>).<\/li><\/ul><div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-ast-global-color-2-color has-text-color has-link-color wp-elements-b09272d1b10175df27cc87ab31c9e21e\" id=\"h-self-extinguishing-condition\" style=\"font-size:20px\">Self-Extinguishing Condition:<\/h4><div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li>If flames extinguish before reaching the 100mm mark, the material qualifies as HB regardless of thickness.<\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-0ac9fbf751cae6cccdfd7983e0fe8ba6\" id=\"h-test-procedure\" style=\"font-size:28px\">Test Procedure<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul start=\"1\"><li>Horizontally fix the sample on a stand and apply flame to the free end for 30 seconds before removal;<\/li>\n\n<li>Record the time for the flame front to travel from 25mm to 100mm and calculate burn rate (Formula: V=60\u00d7burn distance\/time);<\/li>\n\n<li>Observe whether dripping occurs and if it ignites cotton beneath (HB allows dripping, but HF-1\/HF-2 grades impose stricter requirements).<\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-2e7a4f6cef8c9add2e3869883d4409c1\" id=\"h-application-scenarios\" style=\"font-size:28px\">Application Scenarios<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li><strong>Low-risk applications<\/strong>: Appliance casings, packaging materials, non-critical electronic components;<\/li>\n\n<li><strong>Foam materials<\/strong>: HBF, HF-1, and HF-2 rated foams must pass horizontal burning tests, with HF-1 prohibiting dripping and HF-2 allowing controlled dripping.<\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-5cb57c939eec2fad4b6560b6c8aaf15c\" id=\"h-key-considerations\" style=\"font-size:28px\">Key Considerations<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li><strong>Thickness specification<\/strong>: UL94 ratings must include material thickness (e.g., &#8220;UL94 HB@3mm&#8221;). Standalone ratings are invalid;<\/li>\n\n<li><strong>Test differences<\/strong>: Horizontal burning (HB) is less stringent than vertical burning (V-series), with the latter simulating more realistic fire spread for high-safety applications.<\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h6 class=\"wp-block-heading has-vivid-red-color has-text-color has-link-color wp-elements-15d402ab56c615e29306015177704f7b\" id=\"h-this-testing-and-classification-system-establishes-a-quantitative-baseline-for-material-flame-retardancy-however-hb-rated-materials-offer-significantly-lower-fire-resistance-compared-to-higher-grades-like-v-0-or-5va-necessitating-careful-selection-based-on-actual-use-cases\" style=\"font-size:16px\">This testing and classification system establishes a quantitative baseline for material flame retardancy. However, HB-rated materials offer significantly lower fire resistance compared to higher grades like V-0 or 5VA, necessitating careful selection based on actual use cases.<\/h6><div style=\"height:150px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h3 class=\"wp-block-heading\" id=\"h-2-v-0-vertical-burning-test\" style=\"font-size:36px\">2. V-0 (Vertical Burning Test)<\/h3><div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"600\" height=\"462\" src=\"https:\/\/kabolux.com\/wp-content\/uploads\/2025\/05\/\u963b\u71c3V.jpg\" alt=\"\" class=\"wp-image-6951\"\/><\/figure><div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading\" id=\"h-definition-and-rating-classification-0\" style=\"font-size:28px\">Definition and Rating Classification<\/h4><div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h6 class=\"wp-block-heading\" id=\"h-v-0-vertical-burning-class-0-is-the-highest-vertical-flame-retardant-rating-in-the-ul94-standard-requiring-materials-to-self-extinguish-rapidly-within-10-seconds-after-flame-removal-without-producing-flaming-drips-that-could-ignite-other-materials-this-rating-is-suitable-for-applications-with-extremely-high-fire-safety-requirements-such-as-core-components-of-electronic-devices-and-critical-automotive-parts\" style=\"font-size:14px\"><strong>V-0 (Vertical Burning Class 0) is the\u00a0<strong>highest vertical flame retardant rating<\/strong>\u00a0in the UL94 standard, requiring materials to self-extinguish rapidly (within 10 seconds) after flame removal without producing flaming drips that could ignite other materials. This rating is suitable for applications with extremely high fire safety requirements, such as core components of electronic devices and critical automotive parts.<\/strong><\/h6><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-66fdb4bbbbbce1d2d6b0aeb4b6c2d44c\" id=\"h-test-conditions-0\" style=\"font-size:28px\">Test Conditions<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-ast-global-color-2-color has-text-color has-link-color wp-elements-00af48042712a26a00c2c89d64bf0297\" id=\"h-sample-requirements-0\" style=\"font-size:20px\">Sample Requirements<\/h4><div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li><strong>Dimensions<\/strong>: Vertically suspended strip-shaped samples sized\u00a0<strong>125mm\u00d713mm\u00d7thickness<\/strong>\u00a0(typically 1.6mm-12.7mm thick).<\/li>\n\n<li><strong>Preconditioning<\/strong>:<ul><li><strong>Standard conditioning<\/strong>: At least 48 hours at\u00a0<strong>23\u00b12\u2103, 50\u00b15% humidity<\/strong>;<\/li>\n\n<li><strong>High-temperature aging<\/strong>: Another set of samples must be placed in a\u00a0<strong>70\u2103 oven<\/strong>\u00a0for 7 days, then cooled to room temperature (to prevent material degradation from moisture absorption or high temperatures affecting test results).<\/li><\/ul><\/li><\/ul><div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-ast-global-color-2-color has-text-color has-link-color wp-elements-428a88f2659c5be67d02ec4b3ace6bb5\" id=\"h-flame-parameters-0\" style=\"font-size:20px\">Flame Parameters<\/h4><div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li>A\u00a0<strong>20mm<\/strong>\u00a0blue flame (using methane gas at 105ml\/min flow rate);<\/li>\n\n<li><strong>Flame Application Method<\/strong>: Applied vertically to the sample&#8217;s lower end for\u00a0<strong>10 seconds<\/strong>\u00a0each time, twice total (if ignition fails on first attempt, replace sample and retest).<\/li><\/ul><div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-ast-global-color-2-color has-text-color has-link-color wp-elements-a5580e1b0d4d290bad464ec499ebe288\" id=\"h-test-environment\" style=\"font-size:20px\">Test Environment<\/h4><div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li>Samples are vertically suspended in a sealed test chamber with\u00a0<strong>absorbent cotton placed 12 inches (300mm) below<\/strong>\u00a0to detect whether drips ignite the cotton.<\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-b60ab089c2e8c9383607fcab1bcfee36\" id=\"h-evaluation-criteria-0\" style=\"font-size:28px\">Evaluation Criteria<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h6 class=\"wp-block-heading\" id=\"h-v-0-rating-requires-meeting-all-the-following-conditions-simultaneously\" style=\"font-size:14px\"><strong>V-0 rating requires meeting all the following conditions simultaneously:<\/strong><\/h6><div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-ast-global-color-2-color has-text-color has-link-color wp-elements-084ebbef95bd76372edfa3c3fffe845f\" id=\"h-afterflame-time\" style=\"font-size:20px\">Afterflame Time:<\/h4><div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li><strong>Single afterflame time<\/strong>\u00a0\u226410 seconds (must be satisfied for each of the two flame applications);<\/li>\n\n<li><strong>Total afterflame time<\/strong>\u00a0(sum of two afterflames) \u226450 seconds.<\/li><\/ul><div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-ast-global-color-2-color has-text-color has-link-color wp-elements-de010a7499b5df13953ea7b401f3d85f\" id=\"h-drip-restrictions\" style=\"font-size:20px\">Drip Restrictions:<\/h4><div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li><strong>No dripping that ignites the cotton below<\/strong>\u00a0(drips may carry flames but must not ignite the cotton).<\/li><\/ul><div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-ast-global-color-2-color has-text-color has-link-color wp-elements-4fa0fa3d0eec9515243da68b0dd6d45c\" id=\"h-sample-integrity\" style=\"font-size:20px\">Sample Integrity:<\/h4><div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li>Samples must\u00a0<strong>not be completely consumed<\/strong>\u00a0by burning, and the flame front must not reach the clamping end (i.e., must not burn to the fixture).<\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-4a2258fdd2b11ecabfc6efb50b1ef0d2\" id=\"h-evaluation-criteria-1\" style=\"font-size:28px\">Evaluation Criteria<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-ast-global-color-2-color has-text-color has-link-color wp-elements-ba24c8a916259bb3f6f4813c25c337c4\" id=\"h-sample-integrity-0\" style=\"font-size:20px\">Sample Integrity:<\/h4><div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul start=\"1\"><li>Vertically fix the sample on a stand and apply flame to the lower end for 10 seconds before removal;<\/li>\n\n<li>Record afterflame time (duration of continued burning after flame removal);<\/li>\n\n<li>After flames extinguish, immediately reapply flame for 10 seconds and record afterflame time again;<\/li>\n\n<li>Check whether the sample burns to the fixture and observe if drips ignite the cotton.<\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-3a889755349fafef7ac93fc1994a2d2d\" id=\"h-application-scenarios-0\" style=\"font-size:28px\">Application Scenarios<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li><strong>High-safety electronic devices<\/strong>: Power adapter housings, PCB substrates, battery separator plates;<\/li>\n\n<li><strong>Automotive industry<\/strong>: Wire harness protectors, internal components of charging stations;<\/li>\n\n<li><strong>Industrial equipment<\/strong>: Motor insulation components, high-voltage switch housings;<\/li>\n\n<li><strong>Medical devices<\/strong>: Precision instrument housings requiring strict fire certifications.<\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-499f5e44d320ce72b9008ca1d5437c13\" id=\"h-key-advantages-and-limitations\" style=\"font-size:28px\">Key Advantages and Limitations<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th class=\"has-text-align-left\" data-align=\"left\"><strong>Advantages<\/strong><\/th><th class=\"has-text-align-left\" data-align=\"left\"><strong>Limitations<\/strong><\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-left\" data-align=\"left\">Rapid self-extinguishing, prevents fire spread<\/td><td class=\"has-text-align-left\" data-align=\"left\">Higher material costs (e.g., halogen\/phosphorus-based flame retardants)<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">No risk of drip ignition<\/td><td class=\"has-text-align-left\" data-align=\"left\">May affect mechanical properties (e.g., increased brittleness)<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Complies with stringent safety certifications (e.g., IEC)<\/td><td class=\"has-text-align-left\" data-align=\"left\">Requires strict thickness labeling (e.g., &#8220;UL94&nbsp;<a href=\"https:\/\/mailto:V-0@1.5mm\/\" target=\"_blank\" rel=\"noreferrer noopener\">V-0@1.5mm<\/a>&#8220;)<\/td><\/tr><\/tbody><\/table><\/figure><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-e1662736d7bb58ca4dc941b80e2e15ef\" id=\"h-important-notes\" style=\"font-size:28px\">Important Notes<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul start=\"1\"><li><strong>Thickness Sensitivity<\/strong>: V-0 pass rates directly correlate with material thickness. For example, a material may achieve V-0 at 1.6mm thickness but downgrade to V-2 when reduced to 0.8mm.<\/li>\n\n<li><strong>Flame Retardant Types<\/strong>:<ul><li><strong>Halogen-based retardants<\/strong>\u00a0(e.g., bromides) easily pass V-0 but may release toxic gases;<\/li>\n\n<li><strong>Halogen-free retardants<\/strong>\u00a0(e.g., aluminum hydroxide, phosphorus-nitrogen) are more eco-friendly but require optimized formulations.<\/li><\/ul><\/li>\n\n<li><strong>Test vs. Real-world Risks<\/strong>: Lab tests simulate open flames, but actual fires require additional evaluation of factors like high temperatures and smoke.<\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-62a98a48c64d0c3693b02eae7168189d\" id=\"h-comparison-with-other-ratings\" style=\"font-size:28px\">Comparison with Other Ratings<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Rating<\/th><th class=\"has-text-align-left\" data-align=\"left\">Afterflame Time (Single)<\/th><th class=\"has-text-align-left\" data-align=\"left\">Drip Ignition of Cotton<\/th><th class=\"has-text-align-left\" data-align=\"left\">Applicable Thickness Range<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-left\" data-align=\"left\">V-0<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u226410 seconds<\/td><td class=\"has-text-align-left\" data-align=\"left\">Not allowed<\/td><td class=\"has-text-align-left\" data-align=\"left\">Wide range<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">V-1<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u226430 seconds<\/td><td class=\"has-text-align-left\" data-align=\"left\">Not allowed<\/td><td class=\"has-text-align-left\" data-align=\"left\">Medium-thick materials<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">V-2<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u226430 seconds<\/td><td class=\"has-text-align-left\" data-align=\"left\">Allowed<\/td><td class=\"has-text-align-left\" data-align=\"left\">Thin materials<\/td><\/tr><\/tbody><\/table><\/figure><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h6 class=\"wp-block-heading has-vivid-red-color has-text-color has-link-color wp-elements-30a100aa0b5b4ba6b911c7f7f9d17b2c\" id=\"h-v-0-is-recognized-as-the-gold-standard-in-the-electronics-industry-its-stringent-test-requirements-ensure-material-safety-under-extreme-conditions-but-material-selection-should-consider-specific-applications-and-cost-effectiveness\" style=\"font-size:16px\">V-0 is recognized as the &#8220;gold standard&#8221; in the electronics industry. Its stringent test requirements ensure material safety under extreme conditions, but material selection should consider specific applications and cost-effectiveness.<\/h6><div style=\"height:150px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h3 class=\"wp-block-heading\" id=\"h-3-v-1-vertical-burning-test\" style=\"font-size:36px\">3. V-1 (Vertical Burning Test)<\/h3><div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"600\" height=\"462\" src=\"https:\/\/kabolux.com\/wp-content\/uploads\/2025\/05\/\u963b\u71c3V.jpg\" alt=\"\" class=\"wp-image-6951\"\/><\/figure><div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading\" id=\"h-definition-and-rating-classification-1\" style=\"font-size:28px\">Definition and Rating Classification<\/h4><div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h6 class=\"wp-block-heading\" id=\"h-v-1-vertical-burning-class-1-is-a-moderate-vertical-flame-retardant-rating-in-the-ul94-standard-requiring-materials-to-self-extinguish-after-flame-removal-but-allowing-longer-afterflame-time-30-seconds-per-application-compared-to-v-0-this-rating-is-suitable-for-medium-to-high-safety-scenarios-requiring-a-balance-between-fire-performance-and-cost-such-as-electronic-device-housings-and-internal-components-of-household-appliances\" style=\"font-size:14px\"><strong>V-1 (Vertical Burning Class 1) is a\u00a0<strong>moderate vertical flame retardant rating<\/strong>\u00a0in the UL94 standard, requiring materials to self-extinguish after flame removal but allowing longer afterflame time (\u226430 seconds per application) compared to V-0. This rating is suitable for medium-to-high safety scenarios requiring a balance between fire performance and cost, such as electronic device housings and internal components of household appliances.<\/strong><\/h6><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-e169f70810b92dd4f8c1169a3f8e61a5\" id=\"h-test-conditions-1\" style=\"font-size:28px\">Test Conditions<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-ast-global-color-2-color has-text-color has-link-color wp-elements-d77b877fdd8b3cfc9a54c4914287e736\" id=\"h-test-conditions-2\" style=\"font-size:20px\">Test Conditions<\/h4><div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul start=\"1\"><li><strong>Sample Requirements<\/strong><ul><li><strong>Dimensions<\/strong>: Vertically suspended strip-shaped samples sized\u00a0<strong>125mm\u00d713mm\u00d7thickness<\/strong>\u00a0(typically 1.6mm-12.7mm thick).<\/li>\n\n<li><strong>Preconditioning<\/strong>:<ul><li><strong>Standard conditioning<\/strong>: At least 48 hours at\u00a0<strong>23\u00b12\u2103, 50\u00b15% humidity<\/strong>;<\/li>\n\n<li><strong>High-temperature aging<\/strong>: Another set of samples must be aged in a\u00a0<strong>70\u2103 oven<\/strong>\u00a0for 7 days, then cooled to room temperature before testing.<\/li><\/ul><\/li><\/ul><\/li><\/ul><div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-ast-global-color-2-color has-text-color has-link-color wp-elements-cd8760a1dc63d577ae652dafc857f9be\" id=\"h-flame-parameters-1\" style=\"font-size:20px\">Flame Parameters<\/h4><div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li><strong>Flame height<\/strong>: 20mm (methane gas at 105ml\/min flow rate);<\/li>\n\n<li><strong>Flame application method<\/strong>: Applied vertically to the sample&#8217;s lower end for\u00a0<strong>10 seconds<\/strong>\u00a0each time, twice total (if ignition fails on first attempt, replace sample).<\/li><\/ul><div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-ast-global-color-2-color has-text-color has-link-color wp-elements-8b6dfb095147874693f6518e1770e191\" id=\"h-test-environment-0\" style=\"font-size:20px\">Test Environment<\/h4><div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li><strong>Absorbent cotton<\/strong>\u00a0placed 300mm below samples to detect whether drips ignite the cotton.<\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-8f7a2e0711b6ab76c62e3031d3f095dd\" id=\"h-evaluation-criteria-2\" style=\"font-size:28px\">Evaluation Criteria<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h6 class=\"wp-block-heading has-ast-global-color-2-color has-text-color has-link-color wp-elements-2517747efe40fec99bc2342bc388ad59\" id=\"h-v-1-rating-requires-meeting-all-the-following-conditions-simultaneously\" style=\"font-size:14px\">V-1 rating requires meeting all the following conditions simultaneously:<\/h6><div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul start=\"1\"><li><strong>Afterflame Time<\/strong>:<ul><li><strong>Single afterflame time<\/strong>\u00a0\u226430 seconds (must be satisfied for both flame applications);<\/li>\n\n<li><strong>Total afterflame time<\/strong>\u00a0(sum of two afterflames) \u2264250 seconds.<\/li><\/ul><\/li>\n\n<li><strong>Drip Restrictions<\/strong>:<ul><li><strong>No dripping that ignites the cotton<\/strong>\u00a0(same as V-0 but with more lenient afterflame time).<\/li><\/ul><\/li>\n\n<li><strong>Sample Integrity<\/strong>:<ul><li>Samples must not be completely consumed by burning, and the flame front must not reach the clamping end.<\/li><\/ul><\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-cbbd4e8d745b39ac486d345f4853b22f\" id=\"h-test-procedure-0\" style=\"font-size:28px\">Test Procedure<\/h4><div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul start=\"1\"><li>Vertically fix the sample and apply flame to the lower end for 10 seconds before removal;<\/li>\n\n<li>Record afterflame time (duration of continued burning after flame removal);<\/li>\n\n<li>After flames extinguish, reapply flame for 10 seconds and record second afterflame time;<\/li>\n\n<li>Check whether drips ignite the cotton and confirm the sample doesn&#8217;t burn to the fixture.<\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-fae5e7d5b0ce10ae91431780027bfa91\" id=\"h-application-scenarios-1\" style=\"font-size:28px\">Application Scenarios<\/h4><div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li><strong>Consumer electronics<\/strong>: Router housings, printer components;<\/li>\n\n<li><strong>Household appliances<\/strong>: Rice cooker bases, vacuum cleaner internal frames;<\/li>\n\n<li><strong>Low-voltage electrical components<\/strong>: Connectors, socket housings;<\/li>\n\n<li><strong>Industrial equipment<\/strong>: Insulation materials for medium-low risk areas.<\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-0195597e594b8d412aa0a3a8a9aedb32\" id=\"h-key-features-and-limitations\" style=\"font-size:28px\">Key Features and Limitations<\/h4><div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th class=\"has-text-align-left\" data-align=\"left\"><strong>Features<\/strong><\/th><th class=\"has-text-align-left\" data-align=\"left\"><strong>Limitations<\/strong><\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-left\" data-align=\"left\">Better self-extinguishing than V-2, lower cost than V-0<\/td><td class=\"has-text-align-left\" data-align=\"left\">Relatively long afterflame time (\u226430s)<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">No risk of drip ignition<\/td><td class=\"has-text-align-left\" data-align=\"left\">Thickness sensitive (thin materials may downgrade)<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Suitable for medium fire protection needs<\/td><td class=\"has-text-align-left\" data-align=\"left\">Requires thickness specification (e.g., &#8220;V-1@2mm&#8221;)<\/td><\/tr><\/tbody><\/table><\/figure><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-b537fe497a5af1be383293b5e7167a5d\" id=\"h-important-notes-0\" style=\"font-size:28px\">Important Notes<\/h4><div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul start=\"1\"><li><strong>Thickness Impact<\/strong>:<ul><li>When material thickness decreases, V-1 may downgrade to V-2 (e.g., a material may achieve V-1 at 3mm but only V-2 at 1mm).<\/li><\/ul><\/li>\n\n<li><strong>Flame Retardant Selection<\/strong>:<ul><li><strong>Phosphorus-based retardants<\/strong>: Environmentally friendly but may prolong afterflame time;<\/li>\n\n<li><strong>Nitrogen-based retardants<\/strong>: Require optimized formulations to meet V-1 time limits.<\/li><\/ul><\/li>\n\n<li><strong>Test Repeatability<\/strong>:<ul><li>If sample fails to ignite on first flame application, replace with new sample and retest.<\/li><\/ul><\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-a70f43f51cbb3b21d4d7ce7a97ed1d93\" id=\"h-comparison-with-other-ratings-0\" style=\"font-size:28px\">Comparison with Other Ratings<\/h4><div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Rating<\/th><th class=\"has-text-align-left\" data-align=\"left\">Single Afterflame Time<\/th><th class=\"has-text-align-left\" data-align=\"left\">Total Afterflame Time<\/th><th class=\"has-text-align-left\" data-align=\"left\">Drip Ignition of Cotton<\/th><th class=\"has-text-align-left\" data-align=\"left\">Typical Thickness Range<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-left\" data-align=\"left\">V-0<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u226410 seconds<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u226450 seconds<\/td><td class=\"has-text-align-left\" data-align=\"left\">Not allowed<\/td><td class=\"has-text-align-left\" data-align=\"left\">1.6-12.7mm<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\"><strong>V-1<\/strong><\/td><td class=\"has-text-align-left\" data-align=\"left\"><strong>\u226430 seconds<\/strong><\/td><td class=\"has-text-align-left\" data-align=\"left\"><strong>\u2264250 seconds<\/strong><\/td><td class=\"has-text-align-left\" data-align=\"left\"><strong>Not allowed<\/strong><\/td><td class=\"has-text-align-left\" data-align=\"left\"><strong>1.0-6mm<\/strong><\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">V-2<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u226430 seconds<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u2264250 seconds<\/td><td class=\"has-text-align-left\" data-align=\"left\">Allowed<\/td><td class=\"has-text-align-left\" data-align=\"left\">&lt;3mm<\/td><\/tr><\/tbody><\/table><\/figure><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-a6255181b5d1882f7f78993257a9a5fb\" id=\"h-material-selection-recommendations\" style=\"font-size:28px\">Material Selection Recommendations<\/h4><div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li><strong>Prefer V-1 for<\/strong>:<ul><li>Cost-sensitive applications requiring basic fire certifications (e.g., IEC 60707);<\/li>\n\n<li>Materials sensitive to flame retardant effects on mechanical properties (V-1 formulations have less impact on flexibility).<\/li><\/ul><\/li>\n\n<li><strong>Avoid V-1 for<\/strong>:<ul><li>High-density wiring areas (afterflame time may cause chain risks);<\/li>\n\n<li>High-temperature or enclosed environments (require higher ratings like V-0 or 5VA).<\/li><\/ul><\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h6 class=\"wp-block-heading has-vivid-red-color has-text-color has-link-color wp-elements-b7228765b16e5209056c49615169f7a7\" id=\"h-v-1-rating-provides-a-cost-effective-balance-between-fire-performance-and-cost-making-it-a-widely-adopted-value-for-money-flame-retardant-standard-in-electronics-manufacturing-and-appliance-industries\" style=\"font-size:16px\">V-1 rating provides a cost-effective balance between fire performance and cost, making it a widely adopted &#8220;value-for-money&#8221; flame retardant standard in electronics manufacturing and appliance industries.<\/h6><div style=\"height:150px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h3 class=\"wp-block-heading\" id=\"h-4-v-2-vertical-burning-test\" style=\"font-size:36px\">4. V-2 (Vertical Burning Test)<\/h3><div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"600\" height=\"462\" src=\"https:\/\/kabolux.com\/wp-content\/uploads\/2025\/05\/\u963b\u71c3V.jpg\" alt=\"\" class=\"wp-image-6951\"\/><\/figure><div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading\" id=\"h-definition-and-rating-classification-2\" style=\"font-size:28px\">Definition and Rating Classification<\/h4><div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h6 class=\"wp-block-heading\" id=\"h-v-2-vertical-burning-class-2-is-the-lowest-flame-retardant-rating-in-ul94-vertical-burning-tests-it-allows-materials-to-produce-flaming-drips-that-may-ignite-cotton-below-after-flame-removal-but-must-meet-afterflame-time-limits-30-seconds-per-application-this-rating-is-suitable-for-applications-with-minimal-fire-safety-requirements-such-as-consumer-electronics-and-non-critical-components\" style=\"font-size:14px\"><strong>V-2 (Vertical Burning Class 2) is the\u00a0<strong>lowest flame retardant rating<\/strong>\u00a0in UL94 vertical burning tests. It allows materials to produce flaming drips that may ignite cotton below after flame removal, but must meet afterflame time limits (\u226430 seconds per application). This rating is suitable for applications with minimal fire safety requirements, such as consumer electronics and non-critical components.<\/strong><\/h6><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-e42613f8d3ff56edb3a68abf6242e268\" id=\"h-test-conditions-3\" style=\"font-size:28px\">Test Conditions<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-ast-global-color-2-color has-text-color has-link-color wp-elements-4471bb50171ab971de4f47bbd58d1cbd\" id=\"h-sample-requirements-1\" style=\"font-size:20px\">Sample Requirements<\/h4><div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li><strong>Dimensions<\/strong>: Vertically suspended strip samples measuring\u00a0<strong>125mm\u00d713mm\u00d7thickness<\/strong>\u00a0(typical thickness \u22643mm).<\/li>\n\n<li><strong>Preconditioning<\/strong>:<ul><li><strong>Standard conditioning<\/strong>: 48 hours at\u00a0<strong>23\u00b12\u00b0C, 50\u00b15% humidity<\/strong>;<\/li>\n\n<li><strong>High-temperature aging<\/strong>: Additional samples aged in\u00a0<strong>70\u00b0C oven<\/strong>\u00a0for 7 days, then cooled before testing.<\/li><\/ul><\/li><\/ul><div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-ast-global-color-2-color has-text-color has-link-color wp-elements-cfe63ebe13f603cd3217ad1a82073e55\" id=\"h-flame-parameters-2\" style=\"font-size:20px\">Flame Parameters<\/h4><div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li><strong>Flame height<\/strong>: 20mm (methane gas at 105ml\/min flow rate);<\/li>\n\n<li><strong>Flame application method<\/strong>: Applied vertically to sample&#8217;s lower end for\u00a0<strong>10 seconds<\/strong>\u00a0each time, twice total (replace sample if ignition fails first attempt).<\/li><\/ul><div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-ast-global-color-2-color has-text-color has-link-color wp-elements-2c52234f6d25b10150c53f25ac968c2e\" id=\"h-test-environment-1\" style=\"font-size:20px\">Test Environment<\/h4><div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li><strong>Absorbent cotton<\/strong>\u00a0placed 300mm below samples to detect ignition by drips.<\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-c0ea1999ad334c425b908c4dc9d4e0e0\" id=\"h-evaluation-criteria-3\" style=\"font-size:28px\">Evaluation Criteria<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h6 class=\"wp-block-heading has-ast-global-color-2-color has-text-color has-link-color wp-elements-923925be46c8295300a80ff023bfb0b9\" id=\"h-v-2-rating-must-meet\" style=\"font-size:14px\">V-2 rating must meet:<\/h6><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul start=\"1\"><li><strong>Afterflame Time<\/strong>:<ul><li><strong>Single afterflame time<\/strong>\u00a0\u226430 seconds (both applications);<\/li>\n\n<li><strong>Total afterflame time<\/strong>\u00a0(sum of both) \u2264250 seconds.<\/li><\/ul><\/li>\n\n<li><strong>Drip Behavior<\/strong>:<ul><li><strong>Flaming drips allowed to ignite cotton<\/strong>\u00a0(key difference from V-0\/V-1).<\/li><\/ul><\/li>\n\n<li><strong>Sample Integrity<\/strong>:<ul><li>Sample must not burn completely; flame front must not reach clamp.<\/li><\/ul><\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-04d8010390ea7242a0386e9efd009b6e\" id=\"h-test-procedure-1\" style=\"font-size:28px\">Test Procedure<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul start=\"1\"><li>Vertically fix sample, apply flame to lower end for 10 seconds then remove;<\/li>\n\n<li>Record afterflame time;<\/li>\n\n<li>After extinguishing, reapply flame for 10 seconds and record again;<\/li>\n\n<li>Observe if drips ignite cotton and confirm sample doesn&#8217;t burn to clamp.<\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-d8acfb770b286032b5f7526eaf56df5c\" id=\"h-application-scenarios-2\" style=\"font-size:28px\">Application Scenarios<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li><strong>Consumer electronics<\/strong>: Phone charger casings, earphone plastic parts;<\/li>\n\n<li><strong>Low-risk appliances<\/strong>: Fan blades, humidifier housings;<\/li>\n\n<li><strong>Toys &amp; daily items<\/strong>: Plastic toy shells, stationery components;<\/li>\n\n<li><strong>Temporary materials<\/strong>: Exhibition decor materials, packaging accessories.<\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-a90eb31917b741ae5f02b84579b31a35\" id=\"h-key-features-and-limitations-0\" style=\"font-size:28px\">Key Features and Limitations<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th><strong>Features<\/strong><\/th><th><strong>Limitations<\/strong><\/th><\/tr><\/thead><tbody><tr><td>Low cost, easy to pass test<\/td><td>Drips may ignite flammables<\/td><\/tr><tr><td>Suitable for thin materials (&lt;3mm)<\/td><td>Weak fire resistance, not for enclosed spaces<\/td><\/tr><tr><td>Meets basic fire certification<\/td><td>Requires strict thickness marking (e.g. &#8220;V-2@1mm&#8221;)<\/td><\/tr><\/tbody><\/table><\/figure><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-ef84b4df4a9a3d204c16e4cfe4d41d99\" id=\"h-important-notes-1\" style=\"font-size:28px\">Important Notes<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul start=\"1\"><li><strong>Thickness Sensitivity<\/strong>:<ul><li>Primarily for thin materials (1-2mm); thicker versions may qualify for V-1\/V-0.<\/li><\/ul><\/li>\n\n<li><strong>Drip Risk Management<\/strong>:<ul><li>Avoid use near flammables (e.g. textiles\/paper).<\/li><\/ul><\/li>\n\n<li><strong>Flame Retardant Selection<\/strong>:<ul><li>Typically uses\u00a0<strong>low-cost retardants<\/strong>\u00a0(e.g. magnesium hydroxide), but may reduce material toughness.<\/li><\/ul><\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-89c83e4ecfb38d0ff97249c942dfc0e8\" id=\"h-comparison-with-other-ratings-1\" style=\"font-size:28px\">Comparison with Other Ratings<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>Rating<\/th><th>Single Afterflame Time<\/th><th>Drip Ignition<\/th><th>Thickness Range<\/th><th>Risk Level<\/th><\/tr><\/thead><tbody><tr><td>V-0<\/td><td>\u226410s<\/td><td>Not allowed<\/td><td>1.6-12.7mm<\/td><td>Very High<\/td><\/tr><tr><td>V-1<\/td><td>\u226430s<\/td><td>Not allowed<\/td><td>1.0-6mm<\/td><td>Medium<\/td><\/tr><tr><td><strong>V-2<\/strong><\/td><td><strong>\u226430s<\/strong><\/td><td><strong>Allowed<\/strong><\/td><td><strong>&lt;3mm<\/strong><\/td><td><strong>Low<\/strong><\/td><\/tr><\/tbody><\/table><\/figure><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-592ab390b8567fd30db127d7fb727dd9\" id=\"h-material-selection-guidelines\" style=\"font-size:28px\">Material Selection Guidelines<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li><strong>Prefer V-2 when<\/strong>:<ul><li>Cost-sensitive with controlled fire risk (e.g. ventilated areas);<\/li>\n\n<li>Non-permanent or temporary products (e.g. promotional items).<\/li><\/ul><\/li>\n\n<li><strong>Avoid V-2 when<\/strong>:<ul><li>High-density electrical equipment (drips may cause shorts);<\/li>\n\n<li>High-reliability fields like medical\/automotive.<\/li><\/ul><\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h6 class=\"wp-block-heading has-vivid-red-color has-text-color has-link-color wp-elements-1e5b0a028a2ab71ff696571f89815414\" id=\"h-the-v-2-rating-provides-an-economical-flame-retardant-solution-for-low-risk-scenarios-but-its-allowance-of-flaming-drips-requires-careful-consideration-of-actual-usage-environments-to-avoid-potential-safety-hazards\" style=\"font-size:16px\">The V-2 rating provides an economical flame retardant solution for low-risk scenarios, but its allowance of flaming drips requires careful consideration of actual usage environments to avoid potential safety hazards.<\/h6><div style=\"height:150px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h3 class=\"wp-block-heading\" id=\"h-5-5va-5vb-vertical-burning-test\" style=\"font-size:36px\">5. 5VA\/5VB (Vertical Burning Test)<\/h3><div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"462\" src=\"https:\/\/kabolux.com\/wp-content\/uploads\/2025\/05\/\u963b\u71c35V.jpg\" alt=\"\" class=\"wp-image-6953\"\/><\/figure><div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading\" id=\"h-definition-and-rating-classification-3\" style=\"font-size:28px\">Definition and Rating Classification<\/h4><div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h6 class=\"wp-block-heading\" id=\"h-5va-and-5vb-represent-the-highest-flame-retardant-ratings-in-the-ul94-standard-specifically-designed-for-extreme-fire-protection-requirements-these-ratings-apply-to-bulk-or-thick-plate-materials-e-g-engineering-plastics-composites-both-undergo-rigorous-multiple-flame-application-tests-with-the-key-difference-being\" style=\"font-size:14px\"><strong>5VA and 5VB represent the\u00a0<strong>highest flame retardant ratings<\/strong>\u00a0in the UL94 standard, specifically designed for extreme fire protection requirements. These ratings apply to bulk or thick plate materials (e.g., engineering plastics, composites). Both undergo rigorous multiple flame application tests, with the key difference being:<\/strong><\/h6><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li><strong>5VA<\/strong>: No burn-through allowed, with afterflame time \u226460 seconds;<\/li>\n\n<li><strong>5VB<\/strong>: Local burn-through permitted, but afterflame time \u226460 seconds.<br><strong>Typical applications<\/strong>: Aerospace, military equipment, high-voltage electrical components.<\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-50dfa9ad96d5f8af203f2147bcbdc9bb\" id=\"h-test-conditions-4\" style=\"font-size:28px\">Test Conditions<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-ast-global-color-2-color has-text-color has-link-color wp-elements-9e1d3874df4dbf4d5c76519f52aed33c\" id=\"h-sample-requirements-2\" style=\"font-size:20px\">Sample Requirements<\/h4><div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li><strong>Sample Types<\/strong>:<ul><li><strong>Bar samples<\/strong>\u00a0(testing material&#8217;s inherent flame resistance): 125mm\u00d713mm\u00d7thickness;<\/li>\n\n<li><strong>Plate samples<\/strong>\u00a0(testing burn-through resistance): 150mm\u00d7150mm\u00d7thickness (minimum 3mm).<\/li><\/ul><\/li>\n\n<li><strong>Preconditioning<\/strong>:<ul><li>48 hours at\u00a0<strong>23\u00b12\u2103, 50\u00b15% humidity<\/strong>;<\/li>\n\n<li>Additional samples aged in\u00a0<strong>70\u2103 oven<\/strong>\u00a0for 7 days.<\/li><\/ul><\/li><\/ul><div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-ast-global-color-2-color has-text-color has-link-color wp-elements-59c900e2c7a817ccdd9d328f9cc0c6e9\" id=\"h-flame-parameters-3\" style=\"font-size:20px\">Flame Parameters<\/h4><div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li><strong>Flame height<\/strong>: 125mm (5 inches) (methane gas at 965ml\/min);<\/li>\n\n<li><strong>Flame Application<\/strong>:<ul><li>20\u00b0 inclined flame applied to sample surface (5 applications of 5 seconds each for bars; 5 applications at plate center for plates).<\/li><\/ul><\/li><\/ul><div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-ast-global-color-2-color has-text-color has-link-color wp-elements-2a9a69c9915511dad685a021c38640b9\" id=\"h-evaluation-criteria-4\" style=\"font-size:20px\">Evaluation Criteria<\/h4><div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>Rating<\/th><th>Single Afterflame Time<\/th><th>Total Afterflame Time (5x)<\/th><th>Burn-Through Limit<\/th><th>Drip Ignition<\/th><\/tr><\/thead><tbody><tr><td><strong>5VA<\/strong><\/td><td>\u226460 seconds<\/td><td>\u2264300 seconds<\/td><td><strong>Not allowed<\/strong><\/td><td>Not allowed<\/td><\/tr><tr><td><strong>5VB<\/strong><\/td><td>\u226460 seconds<\/td><td>\u2264300 seconds<\/td><td><strong>Allowed<\/strong><\/td><td>Not allowed<\/td><\/tr><\/tbody><\/table><\/figure><div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-ast-global-color-2-color has-text-color has-link-color wp-elements-d7c9343c8a17c2082ceebc4508a2de2a\" id=\"h-additional-requirements\" style=\"font-size:20px\">Additional Requirements:<\/h4><div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li>Samples must not be completely consumed;<\/li>\n\n<li>For plates, no holes >30mm diameter allowed in flame application area (5VA only).<\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-d27626ae75e8a03a9d71ecf0c48b7a0e\" id=\"h-test-procedure-2\" style=\"font-size:28px\">Test Procedure<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul start=\"1\"><li><strong>Bar Sample Testing<\/strong>:<ul><li>Apply 20\u00b0 inclined flame to sample end (5 applications of 5 seconds each);<\/li>\n\n<li>Record afterflame times and check for burn-through.<\/li><\/ul><\/li>\n\n<li><strong>Plate Sample Testing<\/strong>:<ul><li>Apply vertical flame to plate center (5 applications of 5 seconds each);<\/li>\n\n<li>Measure burn-through depth\/hole size (5VA only).<\/li><\/ul><\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-f4fabd31dcd2dd74b24857a88d0180a1\" id=\"h-application-scenarios-3\" style=\"font-size:28px\">Application Scenarios<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li><strong>5VA<\/strong>:<ul><li>Aerospace cabin materials (aircraft seat frames, dashboard components);<\/li>\n\n<li>High-voltage electrical equipment (substation insulation boards, charging station housings);<\/li>\n\n<li>Military protective gear (ballistic plate covers, ammunition case shells).<\/li><\/ul><\/li>\n\n<li><strong>5VB<\/strong>:<ul><li>Industrial machinery high-temperature shields;<\/li>\n\n<li>Automotive engine bay heat-resistant parts;<\/li>\n\n<li>High-temperature furnace housings (must withstand local burn-through).<\/li><\/ul><\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-9e5762f739203782f74877a048d8048f\" id=\"h-key-advantages-and-limitations-0\" style=\"font-size:28px\">Key Advantages and Limitations<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th><strong>Advantages<\/strong><\/th><th><strong>Limitations<\/strong><\/th><\/tr><\/thead><tbody><tr><td>Superior burn-through resistance vs. V-series<\/td><td>High testing costs (multiple flame applications)<\/td><\/tr><tr><td>Suitable for thick materials (\u22653mm)<\/td><td>Complex material formulations (require high-efficiency retardants)<\/td><\/tr><tr><td>Complies with stringent international standards (e.g., Airbus AIMS)<\/td><td>May compromise material lightweight properties<\/td><\/tr><\/tbody><\/table><\/figure><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-d93b281767299116aaf8c6d6b2be9d60\" id=\"h-important-notes-2\" style=\"font-size:28px\">Important Notes<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul start=\"1\"><li><strong>Thickness and Formulation Optimization<\/strong>:<ul><li>Materials &lt;3mm thick typically cannot pass 5VA\/5VB tests;<\/li>\n\n<li>Commonly use\u00a0<strong>glass-fiber reinforced materials<\/strong>\u00a0(e.g., PA66+30%GF) or\u00a0<strong>specialty engineering plastics<\/strong>\u00a0(e.g., PEEK, PEI).<\/li><\/ul><\/li>\n\n<li><strong>Flame Retardant Selection<\/strong>:<ul><li><strong>Halogen-free systems<\/strong>\u00a0(e.g., red phosphorus, nitrogen-phosphorus) require precise dosing to avoid mechanical property degradation;<\/li>\n\n<li><strong>Ceramifying additives<\/strong>\u00a0can enhance burn-through resistance (for 5VA).<\/li><\/ul><\/li>\n\n<li><strong>Common Failure Reasons<\/strong>:<ul><li>Excessive afterflame time (insufficient retardant efficiency);<\/li>\n\n<li>Plate sample burn-through (poor material thermal stability).<\/li><\/ul><\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-4d42794b411f854dceec163f74b828c8\" id=\"h-comparison-with-other-ratings-2\" style=\"font-size:28px\">Comparison with Other Ratings<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>Rating<\/th><th>Test Objects<\/th><th>Flame Applications<\/th><th>Burn-Through Limit<\/th><th>Typical Thickness<\/th><\/tr><\/thead><tbody><tr><td>V-0<\/td><td>Thin materials<\/td><td>2x (10s each)<\/td><td>Not allowed<\/td><td>1.6-3mm<\/td><\/tr><tr><td>5VA<\/td><td>Bulk\/plate materials<\/td><td>5x (5s each)<\/td><td>Not allowed<\/td><td>\u22653mm<\/td><\/tr><tr><td>5VB<\/td><td>Bulk\/plate materials<\/td><td>5x (5s each)<\/td><td>Allowed<\/td><td>\u22653mm<\/td><\/tr><\/tbody><\/table><\/figure><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-85e09e9a5e0665ebd9292280f0454f14\" id=\"h-material-selection-guidelines-0\" style=\"font-size:28px\">Material Selection Guidelines<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li><strong>Prefer 5VA when<\/strong>:<ul><li>Simultaneous flame resistance and structural strength needed (e.g., high-voltage insulation parts);<\/li>\n\n<li>Regulations mandate no burn-through risk (e.g., aircraft interior materials).<\/li><\/ul><\/li>\n\n<li><strong>Prefer 5VB when<\/strong>:<ul><li>Local burn-through acceptable but flame spread must be controlled (e.g., industrial equipment housings);<\/li>\n\n<li>Cost-sensitive with thicker materials (higher pass rate than 5VA).<\/li><\/ul><\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h6 class=\"wp-block-heading has-vivid-red-color has-text-color has-link-color wp-elements-7d2cb2fce9bb24d28b6b712daf50429f\" id=\"h-the-5va-5vb-ratings-represent-ul94-s-most-stringent-fire-protection-requirements-by-withstanding-multiple-flame-impact-tests-these-materials-effectively-suppress-fire-spread-in-extreme-environments-making-them-the-preferred-certification-standard-for-high-end-industrial-and-military-applications\" style=\"font-size:16px\">The 5VA\/5VB ratings represent UL94&#8217;s most stringent fire protection requirements. By withstanding multiple flame impact tests, these materials effectively suppress fire spread in extreme environments, making them the preferred certification standard for high-end industrial and military applications.<\/h6><div style=\"height:150px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h3 class=\"wp-block-heading\" id=\"h-6-vtm-series-thin-film-materials\" style=\"font-size:36px\">6. VTM Series (Thin Film Materials)<\/h3><div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading\" id=\"h-definition-and-rating-classification-4\" style=\"font-size:28px\">Definition and Rating Classification<\/h4><div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h6 class=\"wp-block-heading\" id=\"h-the-vtm-vertical-thin-material-series-is-designed-for-thin-film-sheet-materials-with-thickness-0-25mm-under-ul94-standards-comprising-three-sub-ratings-vtm-0-vtm-1-and-vtm-2-this-series-adapts-testing-methods-e-g-sample-fixation-to-accommodate-the-high-flexibility-and-deformability-of-thin-films-making-it-widely-applicable-in-packaging-flexible-electronics-lightweight-components-and-other-fields\" style=\"font-size:14px\"><strong>The VTM (Vertical Thin Material) series is designed for\u00a0<strong>thin film\/sheet materials with thickness \u22640.25mm<\/strong>\u00a0under UL94 standards, comprising three sub-ratings: VTM-0, VTM-1, and VTM-2. This series adapts testing methods (e.g., sample fixation) to accommodate the high flexibility and deformability of thin films, making it widely applicable in packaging, flexible electronics, lightweight components, and other fields.<\/strong><\/h6><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-cf77b403460b7d6aabeea404414000ad\" id=\"h-test-conditions-5\" style=\"font-size:28px\">Test Conditions<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-ast-global-color-2-color has-text-color has-link-color wp-elements-aeddce57c782e9669b687974c3b66668\" id=\"h-sample-requirements-3\" style=\"font-size:20px\">Sample Requirements<\/h4><div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li><strong>Dimensions<\/strong>: Film samples sized\u00a0<strong>200mm\u00d750mm\u00d7thickness<\/strong>\u00a0(thickness\u22640.25mm). Multiple layers may be stacked to achieve total thickness\u22650.25mm if single layer is insufficient.<\/li>\n\n<li><strong>Preconditioning<\/strong>:<ul><li>48 hours at\u00a0<strong>23\u00b12\u2103, 50\u00b15% humidity<\/strong>;<\/li>\n\n<li>Additional samples aged in\u00a0<strong>70\u2103 oven<\/strong>\u00a0for 7 days.<\/li><\/ul><\/li><\/ul><div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-ast-global-color-2-color has-text-color has-link-color wp-elements-a69c6d692111de6f9b18ef12600cf4cb\" id=\"h-flame-parameters-4\" style=\"font-size:20px\">Flame Parameters<\/h4><div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li><strong>Flame height<\/strong>: 20mm (methane gas at 105ml\/min);<\/li>\n\n<li><strong>Flame Application<\/strong>:<ul><li>Vertical application to film&#8217;s lower end for\u00a0<strong>3 seconds<\/strong>\u00a0(shorter than standard V-series to prevent rapid burn-through).<\/li><\/ul><\/li><\/ul><div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-ast-global-color-2-color has-text-color has-link-color wp-elements-eb3ce44bba29cda94dd23a5ea8c27175\" id=\"h-test-setup\" style=\"font-size:20px\">Test Setup<\/h4><div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li>Films must be secured in metal frames for vertical suspension without wrinkles;<\/li>\n\n<li><strong>Absorbent cotton<\/strong>\u00a0placed 300mm below to detect drip ignition.<\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-397781fa688655e2e45e2de1e1072e6f\" id=\"h-evaluation-criteria-5\" style=\"font-size:28px\">Evaluation Criteria<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>Rating<\/th><th>Single Afterflame Time<\/th><th>Total Afterflame Time (2 tests)<\/th><th>Drip Ignition<\/th><th>Burn-Through Limit<\/th><\/tr><\/thead><tbody><tr><td><strong>VTM-0<\/strong><\/td><td>\u226410 seconds<\/td><td>\u226430 seconds<\/td><td>Not allowed<\/td><td>No complete burn<\/td><\/tr><tr><td><strong>VTM-1<\/strong><\/td><td>\u226430 seconds<\/td><td>\u2264250 seconds<\/td><td>Not allowed<\/td><td>Local burn allowed<\/td><\/tr><tr><td><strong>VTM-2<\/strong><\/td><td>\u226430 seconds<\/td><td>\u2264250 seconds<\/td><td>Allowed<\/td><td>Local burn allowed<\/td><\/tr><\/tbody><\/table><\/figure><div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-vivid-red-color has-text-color has-link-color wp-elements-7a3c607bb6599512e6cfc8b452081cb9\" id=\"h-additional-requirements-0\" style=\"font-size:20px\">Additional Requirements:<\/h4><div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li>Samples must not detach from fixture;<\/li>\n\n<li>Burn length \u226460% of original length.<\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-fdc755eed802ead23f74d19338cda298\" id=\"h-test-procedure-3\" style=\"font-size:28px\">Test Procedure<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul start=\"1\"><li>Securely mount film sample in metal frame for vertical suspension;<\/li>\n\n<li>Apply flame to lower end for 3 seconds, then remove and record afterflame time;<\/li>\n\n<li>Repeat with another sample (replace if ignition fails initially);<\/li>\n\n<li>Check for drip ignition and sample burn extent.<\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-35267daba6fe0cdbea2aa2cb7847f606\" id=\"h-application-scenarios-4\" style=\"font-size:28px\">Application Scenarios<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li><strong>VTM-0<\/strong>:<ul><li><strong>High-safety films<\/strong>: Lithium battery separators, flexible PCB substrates;<\/li>\n\n<li><strong>Military packaging<\/strong>: Ammunition moisture-proof seals, aircraft protective films.<\/li><\/ul><\/li>\n\n<li><strong>VTM-1\/VTM-2<\/strong>:<ul><li><strong>Consumer electronics<\/strong>: Smartphone screen protectors, wearable device adhesive layers;<\/li>\n\n<li><strong>Industrial materials<\/strong>: Lightweight thermal insulation films, temporary anti-corrosion coatings;<\/li>\n\n<li><strong>Packaging<\/strong>: Flame-retardant food packaging bags, anti-static films for electronic components.<\/li><\/ul><\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-c490e7bf5d2f4d774d1382dc06d2f87b\" id=\"h-key-features-and-challenges\" style=\"font-size:28px\">Key Features and Challenges<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th><strong>Features<\/strong><\/th><th><strong>Challenges<\/strong><\/th><\/tr><\/thead><tbody><tr><td>Adapts to ultra-thin materials (0.01-0.25mm)<\/td><td>Flame retardants may affect flexibility\/transparency<\/td><\/tr><tr><td>Testing method prevents excessive burning<\/td><td>Multi-layer stacking may mask single-layer performance<\/td><\/tr><tr><td>Meets lightweight product fire safety needs<\/td><td>Special fixtures required to prevent deformation<\/td><\/tr><\/tbody><\/table><\/figure><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-f28cfa6869c79f335650e8d5366cd651\" id=\"h-important-notes-3\" style=\"font-size:28px\">Important Notes<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul start=\"1\"><li><strong>Thickness and Layer Effects<\/strong>:<ul><li>For ultra-thin films (e.g., 0.05mm), stacking to \u22650.25mm may compromise true flame retardancy.<\/li><\/ul><\/li>\n\n<li><strong>Flame Retardant Selection<\/strong>:<ul><li><strong>Nano retardants<\/strong>\u00a0(e.g., layered silicates): Minimize transparency impact;<\/li>\n\n<li><strong>Coating processes<\/strong>: Apply flame-retardant coatings (e.g., intumescent) to avoid substrate modification.<\/li><\/ul><\/li>\n\n<li><strong>Test Accuracy Control<\/strong>:<ul><li>Films are airflow-sensitive &#8211; tests must be conducted in enclosed chambers;<\/li>\n\n<li>Fixtures must prevent edge heat conduction interference.<\/li><\/ul><\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-8a9e972ccaa5a04c492c8338ec08ee3b\" id=\"h-comparison-with-other-ratings-3\" style=\"font-size:28px\">Comparison with Other Ratings<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>Rating<\/th><th>Applicable Thickness<\/th><th>Flame Application Time<\/th><th>Drip Restriction<\/th><th>Typical Applications<\/th><\/tr><\/thead><tbody><tr><td><strong>VTM-0<\/strong><\/td><td>\u22640.25mm<\/td><td>3 sec\/application<\/td><td>Not allowed<\/td><td>High-reliability electronic films<\/td><\/tr><tr><td>V-0<\/td><td>1.6-12.7mm<\/td><td>10 sec\/application<\/td><td>Not allowed<\/td><td>Electronic component structures<\/td><\/tr><tr><td>5VA<\/td><td>\u22653mm<\/td><td>5 sec\/application (5x)<\/td><td>Not allowed<\/td><td>Aerospace thick plate materials<\/td><\/tr><\/tbody><\/table><\/figure><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-36889dccd710019a73cda4993f021b80\" id=\"h-material-selection-guidelines-1\" style=\"font-size:28px\">Material Selection Guidelines<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li><strong>Prefer VTM-0 when<\/strong>:<ul><li>UL-certified medical device packaging required (e.g., sterile flame-retardant bags);<\/li>\n\n<li>Flexible sensor substrates for high-temperature environments.<\/li><\/ul><\/li>\n\n<li><strong>Prefer VTM-2 when<\/strong>:<ul><li>Low-cost, short-term packaging needed (e.g., electronic product transport films);<\/li>\n\n<li>Non-enclosed environments where drip risk is acceptable.<\/li><\/ul><\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h6 class=\"wp-block-heading has-vivid-red-color has-text-color has-link-color wp-elements-d44efcd9273e38a022db2baf398f5740\" id=\"h-the-vtm-series-fills-ul94-s-gap-in-testing-ultra-thin-materials-balancing-physical-properties-with-flame-retardancy-requirements-through-adaptive-methods-providing-critical-safety-design-standards-for-lightweight-flexible-products\" style=\"font-size:16px\">The VTM series fills UL94&#8217;s gap in testing ultra-thin materials, balancing physical properties with flame retardancy requirements through adaptive methods, providing critical safety design standards for lightweight, flexible products.<\/h6><div style=\"height:150px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h3 class=\"wp-block-heading\" id=\"h-7-hf-series-foamed-materials\" style=\"font-size:36px\">7. HF Series (Foamed Materials)<\/h3><div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading\" id=\"h-definition-and-rating-classification-5\" style=\"font-size:28px\">Definition and Rating Classification<\/h4><div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h6 class=\"wp-block-heading\" id=\"h-the-hf-horizontal-foamed-material-series-is-specifically-designed-for-foamed-materials-e-g-polyurethane-foam-eps-eva-foam-under-ul94-standards-comprising-three-sub-ratings-hbf-hf-1-and-hf-2-due-to-their-porous-structure-which-accelerates-burning-the-hf-series-evaluates-flame-retardancy-through-adapted-test-methods-making-it-suitable-for-packaging-building-insulation-automotive-interiors-and-other-applications\" style=\"font-size:14px\"><strong>The HF (Horizontal Foamed Material) series is specifically designed for\u00a0<strong>foamed materials<\/strong>\u00a0(e.g., polyurethane foam, EPS\/EVA foam) under UL94 standards, comprising three sub-ratings: HBF, HF-1, and HF-2. Due to their porous structure which accelerates burning, the HF series evaluates flame retardancy through adapted test methods, making it suitable for packaging, building insulation, automotive interiors and other applications.<\/strong><\/h6><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-55d7db3d0b7da5c38181904d6c8978b2\" id=\"h-test-conditions-6\" style=\"font-size:28px\">Test Conditions<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-ast-global-color-2-color has-text-color has-link-color wp-elements-4c31421b57b083d5e02033c8b08e45ba\" id=\"h-sample-requirements-4\" style=\"font-size:20px\">Sample Requirements<\/h4><div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li><strong>Dimensions<\/strong>: Horizontally placed strip samples sized\u00a0<strong>150mm\u00d750mm\u00d7thickness<\/strong>\u00a0(typical thickness 6-25mm)<\/li>\n\n<li><strong>Preconditioning<\/strong>:<ul><li>48 hours at\u00a0<strong>23\u00b12\u2103, 50\u00b15% humidity<\/strong><\/li>\n\n<li>Additional 7-day aging in\u00a0<strong>70\u2103 oven<\/strong>\u00a0for some tests<\/li><\/ul><\/li><\/ul><div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-ast-global-color-2-color has-text-color has-link-color wp-elements-8db86f54018ade5129ca7d2b6765ca4b\" id=\"h-flame-parameters-5\" style=\"font-size:20px\">Flame Parameters<\/h4><div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li><strong>Flame height<\/strong>: 20mm (methane gas at 105ml\/min)<\/li>\n\n<li><strong>Flame application<\/strong>: Horizontally applied to sample end for\u00a0<strong>30 seconds<\/strong>\u00a0(terminated early if flame front doesn&#8217;t reach 25mm mark)<\/li><\/ul><div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-ast-global-color-2-color has-text-color has-link-color wp-elements-758bcaf379827d6be722b41cef2b18fe\" id=\"h-test-environment-2\" style=\"font-size:20px\">Test Environment<\/h4><div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li>Samples placed horizontally on wire mesh stand with absorbent cotton underneath to detect drip ignition<\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-99e63bfb61860a615eee4593bcb00ea7\" id=\"h-evaluation-criteria-6\" style=\"font-size:28px\">Evaluation Criteria<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>Rating<\/th><th>Maximum Burn Rate<\/th><th>Drip Ignition<\/th><th>Self-extinguishing Requirement<\/th><\/tr><\/thead><tbody><tr><td><strong>HBF<\/strong><\/td><td>\u226440mm\/min<\/td><td>Allowed<\/td><td>No specific time limit<\/td><\/tr><tr><td><strong>HF-1<\/strong><\/td><td>\u226440mm\/min<\/td><td>Not allowed<\/td><td>Flame front extinguishes before 100mm<\/td><\/tr><tr><td><strong>HF-2<\/strong><\/td><td>\u226440mm\/min<\/td><td>Allowed<\/td><td>Flame front extinguishes before 100mm<\/td><\/tr><\/tbody><\/table><\/figure><div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-vivid-red-color has-text-color has-link-color wp-elements-64466dad5cf8f38091199512bba80102\" id=\"h-additional-requirements-1\" style=\"font-size:20px\">Additional Requirements:<\/h4><div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li>Post-test sample residual length \u226560% of original<\/li>\n\n<li>HF-1\/HF-2 must have burn distance \u2264100mm<\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-d29ae5be0f06be85d9b27de297282d68\" id=\"h-test-procedure-4\" style=\"font-size:28px\">Test Procedure<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul start=\"1\"><li>Horizontally fix foam sample, apply flame to free end for 30 seconds then remove<\/li>\n\n<li>Record time for flame front to travel 25mm-100mm, calculate burn rate (V=60\u00d7burn distance\/time)<\/li>\n\n<li>Observe dripping and cotton ignition<\/li>\n\n<li>Verify residual sample length meets requirements<\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-7cded8133f94cb71c6af5491ac8dc6a0\" id=\"h-application-scenarios-5\" style=\"font-size:28px\">Application Scenarios<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li><strong>HBF<\/strong>:<ul><li><strong>Low-risk packaging<\/strong>: Appliance cushioning foam, logistics filling materials<\/li>\n\n<li><strong>Temporary insulation<\/strong>: Exhibition partition foam boards<\/li><\/ul><\/li>\n\n<li><strong>HF-1<\/strong>:<ul><li><strong>Automotive interiors<\/strong>: Seat foam, headliner padding<\/li>\n\n<li><strong>Building fireproofing<\/strong>: Flame-retardant insulation wool, duct liners<\/li><\/ul><\/li>\n\n<li><strong>HF-2<\/strong>:<ul><li><strong>Furniture materials<\/strong>: Sofa cushions, mattress cores<\/li>\n\n<li><strong>Low-cost soundproofing<\/strong>: Studio acoustic foam<\/li><\/ul><\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-0ded9236dd6a12523cf392a9f097f67d\" id=\"h-key-features-and-challenges-0\" style=\"font-size:28px\">Key Features and Challenges<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th><strong>Features<\/strong><\/th><th><strong>Challenges<\/strong><\/th><\/tr><\/thead><tbody><tr><td>Adapts to porous\/lightweight foam structures<\/td><td>Flame retardants may reduce elasticity<\/td><\/tr><tr><td>HF-1 provides drip-free safety assurance<\/td><td>High additive loading may increase density<\/td><\/tr><tr><td>Meets construction\/automotive fire standards<\/td><td>Foam shrinkage during testing may affect results<\/td><\/tr><\/tbody><\/table><\/figure><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-3899a06f3267aeeda7c73eade659c957\" id=\"h-important-notes-4\" style=\"font-size:28px\">Important Notes<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul start=\"1\"><li><strong>Density and Porosity Effects<\/strong>:<ul><li>High-density foams (\u226530kg\/m\u00b3) more likely to pass HF-1; low-density (&lt;20kg\/m\u00b3) typically limited to HBF\/HF-2<\/li><\/ul><\/li>\n\n<li><strong>Flame Retardant Selection<\/strong>:<ul><li><strong>Intumescent retardants<\/strong>: Form char layer on surface (suitable for HF-1)<\/li>\n\n<li><strong>Liquid retardant impregnation<\/strong>: Penetrates pores uniformly but may affect closed-cell structure<\/li><\/ul><\/li>\n\n<li><strong>Test Accuracy Control<\/strong>:<ul><li>Secure samples firmly to prevent shrinkage deformation<\/li>\n\n<li>Remove flame promptly to avoid sustained burning distorting data<\/li><\/ul><\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-b5bfbcecff82a755ab212a21cb101657\" id=\"h-comparison-with-other-ratings-4\" style=\"font-size:28px\">Comparison with Other Ratings<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>Rating<\/th><th>Test Orientation<\/th><th>Material Type<\/th><th>Drip Restriction<\/th><th>Typical Applications<\/th><\/tr><\/thead><tbody><tr><td>HB<\/td><td>Horizontal<\/td><td>Regular plastics<\/td><td>Allowed<\/td><td>Low-risk components<\/td><\/tr><tr><td><strong>HBF<\/strong><\/td><td>Horizontal<\/td><td><strong>Foamed materials<\/strong><\/td><td>Allowed<\/td><td>Packaging fillers<\/td><\/tr><tr><td>HF-1<\/td><td>Horizontal<\/td><td>Foamed materials<\/td><td>Not allowed<\/td><td>Automotive\/building fireproofing<\/td><\/tr><tr><td>V-0<\/td><td>Vertical<\/td><td>Dense plastics<\/td><td>Not allowed<\/td><td>High-safety electronics<\/td><\/tr><\/tbody><\/table><\/figure><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-e47913fb304a0a10a4675cbffcf751ea\" id=\"h-material-selection-guidelines-2\" style=\"font-size:28px\">Material Selection Guidelines<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li><strong>Prefer HF-1 when<\/strong>:<ul><li>Automotive interiors requiring FMVSS 302 compliance<\/li>\n\n<li>Building insulation needing ASTM E84 fire certification<\/li><\/ul><\/li>\n\n<li><strong>Prefer HBF when<\/strong>:<ul><li>Low-cost cushioning packaging without strict flame retardancy needs<\/li>\n\n<li>Short-term use exhibition decor foam<\/li><\/ul><\/li><\/ul><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h6 class=\"wp-block-heading has-vivid-red-color has-text-color has-link-color wp-elements-397ef748785ca63a4ac9172f8640cc1a\" id=\"h-the-hf-series-provides-specialized-standards-for-foamed-materials-through-horizontal-burning-tests-quantifying-flame-retardancy-while-balancing-safety-and-material-functionality-for-lightweight-porous-material-designs\" style=\"font-size:16px\">The HF series provides specialized standards for foamed materials through horizontal burning tests, quantifying flame retardancy while balancing safety and material functionality for lightweight, porous material designs.<\/h6><div style=\"height:150px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h3 class=\"wp-block-heading\" id=\"h-summary-table-of-ul94-flammability-ratings\" style=\"font-size:36px\">Summary Table of UL94 Flammability Ratings<\/h3><div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>Rating<\/th><th>Test Orientation<\/th><th>Applicable Materials<\/th><th>Key Requirements<\/th><th>Typical Applications<\/th><\/tr><\/thead><tbody><tr><td><strong>HB<\/strong><\/td><td>Horizontal<\/td><td>General Plastics\/Low &#8211; Risk Materials<\/td><td>Burn rate\u226440 &#8211; 75mm\/min, dripping allowed<\/td><td>Packaging, appliance casings<\/td><\/tr><tr><td><strong>V &#8211; 0<\/strong><\/td><td>Vertical<\/td><td>High &#8211; Safety Dense Materials<\/td><td>After &#8211; flame\u226410s, no dripping<\/td><td>Electronic core parts, medical devices<\/td><\/tr><tr><td><strong>V &#8211; 1<\/strong><\/td><td>Vertical<\/td><td>Medium &#8211; Thickness Materials<\/td><td>After &#8211; flame\u226430s, no dripping<\/td><td>Electronic enclosures, low &#8211; voltage electrical parts<\/td><\/tr><tr><td><strong>V &#8211; 2<\/strong><\/td><td>Vertical<\/td><td>Thin Materials (&lt;3mm)<\/td><td>After &#8211; flame\u226430s, dripping allowed<\/td><td>Consumer electronics accessories, daily necessities<\/td><\/tr><tr><td><strong>5VA\/5VB<\/strong><\/td><td>Vertical<\/td><td>Thick Plates\/Block Materials<\/td><td>5 &#8211; flame shocks, 5VA no burn &#8211; through, 5VB partial allowed<\/td><td>Aerospace, high &#8211; voltage equipment<\/td><\/tr><tr><td><strong>VTM Series<\/strong><\/td><td>Vertical<\/td><td>Films (\u22640.25mm)<\/td><td>Short &#8211; time flame (3s), divided into VTM &#8211; 0\/1\/2<\/td><td>Lithium &#8211; battery separators, flexible electronics<\/td><\/tr><tr><td><strong>HF Series<\/strong><\/td><td>Horizontal<\/td><td>Foam Materials (e.g., foams)<\/td><td>HF &#8211; 1 no dripping, HBF\/HF &#8211; 2 dripping allowed<\/td><td>Automotive interiors, building insulation<\/td><\/tr><\/tbody><\/table><\/figure><div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-012924231402820627d228dc109622ff\" id=\"h-summary-points\" style=\"font-size:28px\">Summary Points<\/h4><div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-ast-global-color-2-color has-text-color has-link-color wp-elements-3812a3dfbde085a3b067a45beabe943b\" id=\"h-principles-for-selecting-ratings\" style=\"font-size:20px\">Principles for Selecting Ratings\uff1a<\/h4><div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li><strong class=\"\">Safety First<\/strong>\uff1aChoose V &#8211; 0 or 5VA for high &#8211; risk scenarios (like electronic core parts)\uff1b<\/li>\n\n<li><strong class=\"\">Cost &#8211; Performance Balance<\/strong>\uff1aChoose V &#8211; 1\/V &#8211; 2 for moderate requirements, HB\/HF &#8211; 2 for low &#8211; risk cases\uff1b<\/li>\n\n<li><strong class=\"\">Material Adaptation<\/strong>\uff1aUse VTM for films, HF for foam materials, and 5VA\/5VB for thick plates.<\/li><\/ul><div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-ast-global-color-2-color has-text-color has-link-color wp-elements-808ab5ab3d5e9866233ab94075a8cc24\" id=\"h-key-differences\" style=\"font-size:20px\">Key Differences\uff1a<\/h4><div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li><strong class=\"\">Vertical Tests (V Series)<\/strong> are stricter than horizontal tests (HB\/HF)\uff1b<\/li>\n\n<li><strong class=\"\">Drip Control<\/strong> distinguishes V &#8211; 0\/V &#8211; 1 from V &#8211; 2, and HF &#8211; 1 from HBF\/HF &#8211; 2\uff1b<\/li>\n\n<li><strong>Thickness Impact<\/strong>\uff1aThin materials are harder to reach high ratings, and thick materials need 5VA\/5VB.<\/li><\/ul><div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h4 class=\"wp-block-heading has-ast-global-color-2-color has-text-color has-link-color wp-elements-b2c1a70d59e34b48f3a8432a4db6a646\" id=\"h-marking-requirements\" style=\"font-size:20px\">Marking Requirements\uff1a<\/h4><div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><ul><li>The UL rating must specify the thickness (e.g., V &#8211; <a class=\"\" href=\"mailto:0@1.5mm\" target=\"_blank\" rel=\"noreferrer noopener\">0@1.5mm<\/a>), otherwise it&#8217;s invalid.<\/li><\/ul><div style=\"height:150px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><hr class=\"wp-block-separator has-alpha-channel-opacity\"\/><div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><div class=\"wp-block-comments\">\n\n\n\n\n\n<div id=\"respond\" class=\"comment-respond has-link-color has-text-color has-luminous-vivid-orange-color wp-block-post-comments-form has-small-font-size wp-elements-62077e73657e84c0f34c2f5df0fd71a0\">\n\t\t<h3 id=\"reply-title\" class=\"comment-reply-title\">Deja un comentario <small><a rel=\"nofollow\" id=\"cancel-comment-reply-link\" 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HB (Horizontal Burning Test) Definition and Rating Classification HB (Horizontal Burning) is the lowest flame retardant rating in the UL94 standard, suitable for scenarios with minimal fire safety requirements. Materials with this rating may burn slowly after flame removal but exhibit self-extinguishing properties or controlled burn rates. Test [&hellip;]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/kabolux.com\/es\/wp-json\/wp\/v2\/posts\/6849"}],"collection":[{"href":"https:\/\/kabolux.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kabolux.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kabolux.com\/es\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/kabolux.com\/es\/wp-json\/wp\/v2\/comments?post=6849"}],"version-history":[{"count":100,"href":"https:\/\/kabolux.com\/es\/wp-json\/wp\/v2\/posts\/6849\/revisions"}],"predecessor-version":[{"id":6954,"href":"https:\/\/kabolux.com\/es\/wp-json\/wp\/v2\/posts\/6849\/revisions\/6954"}],"wp:attachment":[{"href":"https:\/\/kabolux.com\/es\/wp-json\/wp\/v2\/media?parent=6849"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kabolux.com\/es\/wp-json\/wp\/v2\/categories?post=6849"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kabolux.com\/es\/wp-json\/wp\/v2\/tags?post=6849"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}