GB/T 2408-2021 PDF EnglishUS$365.00 · In stock · Download in 9 seconds
GB/T 2408-2021: Plastics - Determination of burning characteristics - Horizontal and vertical test Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 2408: Historical versions
Similar standardsGB/T 2408-2021: Plastics - Determination of burning characteristics - Horizontal and vertical test---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT2408-2021 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 83.080.01 CCS G 31 Replacing GB/T 2408-2008 Plastics - Determination of burning characteristics - Horizontal and vertical test (IEC 60695-11-10.2013, Fire hazard testing - Part 11-10.Test flames - 50 W horizontal and vertical flame test methods, MOD) Issued on. AUGUST 20, 2021 Implemented on. MARCH 01, 2022 Issued by. State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of ContentsForeword... 3 1 Scope... 6 2 Normative references... 6 3 Terms and definitions... 7 4 Principle... 9 5 Significance of the fire tests... 9 6 Apparatus... 10 7 Test specimens... 12 8 Test method A – Horizontal burning test... 14 9 Test method B – Vertical burning test... 19 Appendix A (Informative) Precision of test method A... 32 Appendix B (Informative) Precision of test method B... 33 References... 34ForewordThis document was drafted in accordance with the rules given in GB/T 1.1-2020, Directives for standardization - Part 1.Rules for the structure and drafting of standardizing documents. This document replaces GB/T 2408-2008, Plastics - Determination of burning characteristics - Horizontal and vertical test. Compared with GB/T 2408-2008, the main technical changes, except editorial changes, are as follows. a) Modify some contents of Terms and definitions (see Chapter 3; Chapter 3 of the 2008 edition); b) Modify the arrangement of the chapters of “Test specimen”, “Method A” and “Method B”, and add relevant information to test specimen dimensions (see Chapter 7, Chapter 8 and Chapter 9; Chapter 7, Chapter 8 and Chapter 9 of the 2008 edition); c) Modify the horizontal burning classification (see 8.4; 8.4 of the 2008 edition); d) Add information on thickness to material classification [see 8.5m) and 9.5l)]; e) Add evaluation criteria for “burned to the holding clamp” (see 9.2.4); f) Delete the figure of “Burner/operator/test specimen orientation” (Figure 6 of the 2008 edition); g) Add the figures of “Clearance gauge”, “Flame application”, “Flame application when there are molten drips”, “HB specimen gauge”, “V specimen gauge (example)”, “Flame front position not classified as ‘burned to the holding clamp’” and “Flame front position classified as ‘burned to the holding clamp’” (see Figure 6 ~ Figure 12). This document uses the redrafting method to modify and adopt IEC 60695-11-10.2013 Fire hazard testing - Part 11-10.Test flames - 50 W horizontal and vertical flame test methods. The main technical differences, except editorial changes, between this document and IEC 60695-11-10.2013, and their reasons are as follows. a) With regard to the normative references, this document makes technical adjustments to adapt to the technical conditions of China. The adjustments are concentrated in Chapter 2 “Normative references”. The specific adjustments are as follows. ● Use GB/T 5169.22-2015 which is equivalent to the international standard to replace IEC 60695-11-4.2011 (see 6.2, 8.2.3, 9.2.2 and 9.2.3); ● Use GB/T 5471-2008 which is equivalent to the international standard to replace ISO 295.2004 (see 7.1); ● Use GB/T 9352-2008 which is equivalent to the international standard to replace ISO 293.2004 (see 7.1); ● Use GB/T 12006.1-2009 which is equivalent to the international standard to replace ISO 307.2007 (see 9.4); ● Use GB/T 17037.1-2019 and GB/T 17037.5-2020 which modify and adopt international standards to replace ISO 294 (all parts) (see 7.1); ● Use GB/T 2918-2018 to replace ISO 291.2008 (see the note of 6.7), and move it to the references; ● Delete the ISO/IEC guideline 51 and the ISO/IEC guideline 104. b) Delete the terms of “as received”, “combustion”, “enclosure”, “fire hazard assessment”, “fire retardant”, “fire risk”, “flame” and “ignition”, because such nouns are general terms and some of them are indicated with the forms like verb or noun, which is inconsistent with the requirements for national standards. c) Modify horizontal burning classification to “The materials shall be classified as HB or HB below, as well as HB40 or HB75” instead of “The materials shall be classified HB, HB40 or HB75”, because c in the requirements for HB classification partly coincides with c in the requirements for HB40 and HB70, while c in the requirements for HB40 is obviously differentiated from that for HB70; so, this modification is made to better guide the criteria for classification (see 8.4). For convenience of use, this document also makes the following editorial changes. a) Change the standard name from “Fire hazard testing - Part 11-10.Test flames - 50 W horizontal and vertical flame test methods” to “Plastics - Determination of burning characteristics - Horizontal and vertical test”. b) Change “electrotechnical products” in the Scope to “plastic and non-metallic materials”. This document was proposed by China Petroleum and Chemical Industry Federation. This document shall be under the jurisdiction of National Technical Committee 15 on Plastic of Standardization Administration of China (SAC/TC 15). Drafting organizations of this document. China Bluestar Chengrand Co., Ltd., Chengdu Kingfa Science & Technology New Material Co., Ltd., Shandong Dawn Polymer Co., Ltd., Guangzhou Quality Supervision and Testing Institute, Nanjing Jiangning Analytical Instrument Co., Ltd., Weihai Lianqiao New Material Science and Technology Co., Ltd., Huafon Group Ltd., Xiamen Defenghang Plastic Industry Co., Ltd., Shenzhen CST Standards Technology Co., Ltd., Fujian Inspection and Research Institute for Product Quality, CGN Juner (Zhejiang) New Materials CO., LTD., Liaocheng University, Qingdao Dagang Customs of P. R. China, Jilin Product Quality Supervision and Inspection Institute. Chief drafting staffs of this document. Cao Jinpeng, Wang Lin, Zhao Lei, Li Xiaozeng, Zheng Ning, Wang Fuhai, Li Hongjie, Zhang Guoqiang, Huang Zhiqin, Zhao Yufen, He Yang, Zhang Lei, Teng Mouyong, Gao Jianguo, Li Shangyu, Xie Peng, Zheng Mingjia, Li Yetian, He Guoshan, Qi Ji, Guo Yingying. This document was first published in 2008, and this is the first revision. Plastics - Determination of burning characteristics - Horizontal and vertical test1 ScopeThis document specifies small-scale laboratory test procedures intended to compare the burning behaviour of different materials used in plastic and non-metallic materials when vertically or horizontally oriented test bar specimens are exposed to a small flame ignition source with a nominal thermal power of 50 W. These test methods determine either the linear burning rate or the self-extinguishing properties of materials.2 Normative referencesThe following documents are normatively referenced in this document and are indispensable for its application. For dated references, only the version corresponding to that date is applicable to this document; for undated references, the latest version (including all amendments) is applicable to this document. GB/T 5169.22-2015, Fire hazard testing for electric and electronic products - Part 22.Test flames - 50 W flame - Apparatus and confirmational test method (IEC 60695-11-4.2011, IDT)3 Terms and definitionsThe following terms and definitions are applicable to this document. Physical object or condition with a potential for an undesirable consequence from fire. Ability of a material or product to burn with a flame under specified conditions. Length of material burned per unit time under specified conditions.4 PrincipleFix a rectangular bar-shaped test specimen to a horizontal or vertical fixture by one end and expose the free end to a specified test flame. Assess the burning behaviour of the horizontally supported bar under specific test conditions by measuring the linear burning rate.5 Significance of the fire testsThe significant feature of these fire test methods is the arrangement of the test specimens in either a horizontal or a vertical position. These testing arrangements make it possible to distinguish between different classes of material flammability. Burning behaviour, as measured by these test methods, is affected by such factors as density, any anisotropy of the material and the thickness of the test specimen.6 ApparatusPlacing a mirror in the chamber to provide a rear view of the test specimen has been found to be useful. The air-circulating oven shall provide a conditioning temperature of 70 °C ± 2 °C, unless otherwise stated in the relevant specification, whilst providing not less than five air changes per hour.7 Test specimensOther measuring devices equivalent to a micrometer may be used to measure thickness if found to be satisfactory. Test specimens with extremes of density, melt flows and filler/reinforcement content may be provided and considered representative of the range if the test results yield the same flame test classification. If the test results do not yield the same flame test8 Test method A – Horizontal burning testThree test specimens shall be tested. Each test specimen shall be marked with two lines perpendicular to the longitudinal axis of the bar, 25 mm ± 1 mm and 100 mm ± 1 mm from the end that is to be exposed to the test flame. With the central axis of the burner tube vertical, place the burner remote from the test specimen and set the burner (see 6.2) to produce a standardized 50 W nominal test flame, conforming with GB/T 5169.22-2015.The flame shall be confirmed.9 Test method B – Vertical burning testClamp the test specimen using the upper 6 mm of its length with the longitudinal axis vertical. The lower end of the test specimen shall be 300 mm ± 10 mm above the horizontal cotton pad (see 6.12). The cotton pad shall be approximately 50 mm × 50 mm × 6 mm (uncompressed thickness) and shall have a maximum mass of 0.08 g (see Figure 3). Maintaining the central axis of the burner tube in the vertical position, approach the test specimen horizontally towards the wide face (see Figure 7). ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 2408-2021 be delivered?Answer: The full copy PDF of English version of GB/T 2408-2021 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 2408-2021_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 2408-2021_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. www.ChineseStandard.us -- GB/T 2408-2021 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds.Question 5: Should I purchase the latest version GB/T 2408-2021?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 2408-2021 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.How to buy and download a true PDF of English version of GB/T 2408-2021?A step-by-step guide to download PDF of GB/T 2408-2021_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).Step 2: Search keyword "GB/T 2408-2021". Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart. Step 4: Select payment option (Via payment agents Stripe or PayPal). Step 5: Customize Tax Invoice -- Fill up your email etc. Step 6: Click "Checkout". Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively. Step 8: Optional -- Go to download PDF. Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice. See screenshots for above steps: Steps 1~3 Steps 4~6 Step 7 Step 8 Step 9 |
