Last year, on a project in Chengdu, the client suddenly notified procurement that fire inspection and acceptance required all carpets to provide a B1-grade test report. The supplier replied, \u201dSome of the test reports are B1 grade, but the current batch hasn\u2019t been sent for testing yet.\u201d The project was delayed by two weeks as a result. Just calculate the comprehensive cost of the hotel\u2019s preparation period per day\u2014at least over a hundred thousand.<\/p>\n
I\u2019ve seen this kind of situation more than ten times over the past few years. Honestly, most hotel procurement teams\u201d understanding of flame-retardant standards stops at \u201das long as there is such a thing,\u201d and very few people really figure out:How exactly is B1 grade tested? Can different testing standards be mutually recognized? Is everything settled once you get the report?<\/strong><\/p>\n First, let\u2019s clarify one concept. The domestic hotel carpet flame-retardant requirement is based on\u00a0GB 8624-2012 \"Classification for burning behavior of building materials and products\"<\/strong>which divides combustion performance into four grades:<\/p>\n What most people understand as \u201dB1 grade\u201d is actually a composite indicator. According to GB 8624, B1 grade must meet the following conditions at the same time:<\/p>\n 1\ufe0f\u20e3\u00a0Critical Heat Flux (CHF) \u2265 4.5 kW\/m\u00b2<\/strong>\u2014In plain terms, this means the material can self-extinguish after the fire source is removed and does not continue burning<\/p>\n 2\ufe0f\u20e3\u00a0Smoke toxicity rating not lower than t1<\/strong>\u2014The toxicity of smoke generated by carpet combustion must not exceed the limit<\/p>\n 3\ufe0f\u20e3\u00a0Flaming drips must not ignite the filter paper<\/strong>\u2014The molten dripping material must not become a new source of ignition<\/p>\n What is often overlooked here is item 2.<\/strong>\u00a0Many carpet materials are inherently flame-retardant and have no problem, but after adding flame retardants, the combustion smoke toxicity exceeds the limit and still cannot pass B1. We sent a batch of samples to SGS for testing; the initial flame retardancy all passed, but the smoke toxicity all triggered alarms\u2014the flame retardant itself became the source of the problem.<\/p>\n The most common flame-retardant test methods for domestic hotel projects are:<\/p>\n The biggest trap I\u2019ve stepped into:<\/strong>\u00a0Some test reports provided by suppliers are ASTM E648 Class I, which can only be said to comply with the U.S. NFPA 101 standard, and there is no direct correspondence between that and GB 8624 B1 grade. For international brand hotels operating in China, domestic fire acceptance still looks at the national standard report.<\/p>\n This may be the most common problem in the industry. When submitting samples for testing, a batch of material used a special flame-retardant formula and process, but during mass production, to cut costs, it was replaced with ordinary yarn or a lower-GSM backing. The test report is real, and the product is real too \u2014 but they are not the same thing.<\/p>\n Last year, when supplying a project in East China for an InterContinental hotel, we proactively requested that during shipment,tripartite batch sampling inspection<\/strong>be conducted and sent to SGS for retesting. It was not that we did not trust our own process; rather, from yarn entering the factory to finished goods leaving the factory, any fluctuation in any process could affect flame-retardant performance. In the end, the report came back with everything qualified, the customer was reassured, and we felt at ease as well.<\/p>\n \ud83d\udca1\u00a0Tip:<\/strong>\u00a0Add one clause to the procurement terms: \u201dretesting by batch sampling of mass-production goods\u201d \u2014 the cost is usually 3,000-5,000 yuan per test, negligible compared with the value of the entire carpet batch, but it can close the 99% risk gap.<\/p>\n Not all carpet flame-retardant solutions are the same. Different materials and processes have completely different underlying logic for flame retardancy:<\/p>\n Nylon 66 carpet (mainly tufted process):<\/strong><\/p>\n Wool carpet:<\/strong><\/p>\n Hand-tufted carpet:<\/strong><\/p>\n Step 1: Confirm the product scope covered by the report<\/strong><\/p>\n The test report will clearly state the product model, batch number, and specification parameters. Check whether they match the SKU you purchased. Some suppliers use one report to cover more than ten models, but in fact only one was tested.<\/p>\n Step 2: Confirm the qualification of the testing institution<\/strong><\/p>\n Domestic recognized flame retardant testing institutions:<\/p>\n Step 3: Confirm the validity period of the report<\/strong><\/p>\n Many purchasers do not know this\u2014testing reports usually do not have a strict validity period, but industry practice recommendswithin 2 years<\/strong>reports for the same product can be accepted. If your product process, raw materials, and formula have not changed, you can keep using it. But if there is any change, it must be retested.<\/p>\n Step 4: Prepare an \u201demergency plan\u201d<\/strong><\/p>\n One suggestion we give clients: reserve **3%-5%** of spare blankets for each project, from the same batch and process as the main lot. In case a certain area requires sampling during acceptance, it will not affect the overall schedule.<\/p>\n The release of the \u201cTechnical Regulations for Evaluating the Combustion Performance of Building Interior Materials\u201d (draft for comments) by the China Academy of Building Research at the end of 2025 sent a signal:Requirements for smoke toxicity levels are being tightened.<\/strong>\u00a0The current t1 level is the entry threshold, and the new regulations may require key areas to reach t0 level.<\/p>\n What does this mean? The impact on carpet manufacturers is direct\u2014flame retardant formulations need to be re-optimized. The old approach of simply increasing the amount of flame retardant to meet the standard will not work, because the more flame retardant used, the higher the smoke toxicity may be. The solution is to start from the yarn raw materials side, choosing base fibers with a higher oxygen index and reducing reliance on flame retardants.<\/p>\n Since 2024, the R&D team at Yisen Carpet has been working on this\u2014together with two domestic chemical fiber factories, it developedmodified nylon 66 yarn<\/strong>with the base oxygen index increased to24%<\/strong>and the amount of flame retardant reduced by about35%<\/strong>while smoke toxicity remains stable at t0 level.<\/p>\n The essence of the problem is not whether there is a report, but whether the purchaser manages flame retardancy as a \u201dsystematic indicator.\u201d The report is only the result; from raw materials to process to quality control to reinspection, if any link in the chain is disconnected, that piece of paper is just a formality.<\/p>\n If you are preparing a hotel carpet purchase, here are a few suggestions:<\/strong><\/p>\n Our team has served more than a hundred hotel projects, and our experience with flame retardancy is: the earlier the standards are communicated, the smoother the later acceptance will be. If you need a specific testing plan or report template reference, you can directly communicate with the technical team at Yisen Carpet\u2014after all, product safety and compliance are the common bottom line for both manufacturers and purchasers.<\/p>\n [Note]<\/strong><\/p>\n \u53bb\u5e74\u6210\u90fd\u4e00\u4e2a\u9879\u76ee\uff0c\u4e1a\u4e3b\u65b9\u4e34\u65f6\u901a\u77e5\u91c7\u8d2d\uff0c\u8bf4\u6d88\u9632\u9a8c\u6536\u8981\u6c42\u6240\u6709\u5730\u6bef\u63d0\u4f9bB1\u7ea7\u68c0\u6d4b\u62a5\u544a\u3002\u4f9b\u5e94\u5546\u90a3\u8fb9\u7ed9\u7684\u56de\u590d\u662f̶ […]<\/p>\n","protected":false},"author":1,"featured_media":1755,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"slim_seo":{"title":"B1\u7ea7\u963b\u71c3\u6807\u51c6\uff1a\u9152\u5e97\u5730\u6bef\u5b89\u5168\u6027\u80fd\u89e3\u6790 - \u827a\u68ee\u5730\u6bef\uff5c\u9ad8\u7aef\u9152\u5e97\u4e0e\u8c6a\u5b85\u624b\u5de5\u5b9a\u5236\u5730\u6bef\u5382\u5bb6","description":"Last year on a project in Chengdu, the owner side suddenly notified procurement that fire acceptance required all carpets to provide a B1-level test report. The supplier\u2019s reply was, \"Some test reports are B1-level, but the current batch hasn\u2019t had time to be sent for testing yet.\" The project was therefore delayed by two weeks. Just calculate the overall cost of each day in the hotel preparation period\u2014it starts at well over a hundred thousand yuan. I\u2019ve seen this kind of scenario more than ten times in recent years. To be honest, most hotel procurement teams\" understanding of flame-retardant standards stays at \"as long as there is such a thing,\u201d and very few"},"_slim_seo_primary_term_category":0,"_slim_seo_primary_term_post_tag":0,"footnotes":""},"categories":[57],"tags":[],"class_list":["post-3485","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hangyedongtai"],"blocksy_meta":{"styles_descriptor":{"styles":{"desktop":"","tablet":"","mobile":""},"google_fonts":[],"version":8}},"_links":{"self":[{"href":"https:\/\/www.essence-carpet.com\/en\/wp-json\/wp\/v2\/posts\/3485","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.essence-carpet.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.essence-carpet.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.essence-carpet.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.essence-carpet.com\/en\/wp-json\/wp\/v2\/comments?post=3485"}],"version-history":[{"count":0,"href":"https:\/\/www.essence-carpet.com\/en\/wp-json\/wp\/v2\/posts\/3485\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.essence-carpet.com\/en\/wp-json\/wp\/v2\/media\/1755"}],"wp:attachment":[{"href":"https:\/\/www.essence-carpet.com\/en\/wp-json\/wp\/v2\/media?parent=3485"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.essence-carpet.com\/en\/wp-json\/wp\/v2\/categories?post=3485"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.essence-carpet.com\/en\/wp-json\/wp\/v2\/tags?post=3485"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\nI. What exactly is B1-grade flame retardancy testing?<\/h2>\n
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\n \nGrade<\/th>\n Name<\/th>\n Applicable scope in hotels<\/th>\n<\/tr>\n<\/thead>\n \n Grade A<\/td>\n Non-combustible materials<\/td>\n Evacuation stairwells, front rooms of fire elevators, etc.<\/td>\n<\/tr>\n \n B1 grade<\/strong><\/td>\n Hard-to-burn materials<\/strong><\/td>\n Guest rooms, corridors, banquet halls, meeting rooms<\/strong><\/td>\n<\/tr>\n \n B2 grade<\/td>\n Combustible materials<\/td>\n Generally not suitable for hotel public areas<\/td>\n<\/tr>\n \n B3 grade<\/td>\n Highly flammable materials<\/td>\n Prohibited from use<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\nII. B1-grade testing hides several \u201dtraps\u201d<\/h2>\n
Trap 1: The test standard does not match the application scenario<\/h3>\n
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\n \nTest standard<\/th>\n Test content<\/th>\n Application scenario<\/th>\n Relationship with B1 grade<\/th>\n<\/tr>\n<\/thead>\n \n GB\/T 11785-2005<\/td>\n Radiant heat source method (critical radiant flux)<\/td>\n For flooring materials only<\/td>\n Mandatory test item for B1 grade<\/td>\n<\/tr>\n \n GB\/T 8626-2007<\/td>\n Ignition and combustion performance (30s\/15s)<\/td>\n General building materials<\/td>\n B1-grade auxiliary indicator<\/td>\n<\/tr>\n \n GB\/T 17658-1999<\/td>\n Carpet combustion performance test<\/td>\n Vertical carpet burning<\/td>\n Additional requirement for some projects<\/td>\n<\/tr>\n \n ASTM E648<\/td>\n Critical radiant flux (U.S. standard)<\/td>\n International brand hotels<\/td>\n Method referenced by NFPA 101<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Trap 2: The sample submitted for testing and the supplied product are two different things<\/h3>\n
\nIII. Flame-retardant differences among carpets with different processes<\/h2>\n
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\nIV. After getting a B1-level report, what else does procurement need to do?<\/h2>\n
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\n5. Flame retardant standard trends for 2026-2027<\/h2>\n
\nBack to the acceptance delay case mentioned at the beginning<\/h2>\n
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