GB/T 20644.2-2025 English PDFUS$289.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 20644.2-2025: Special environmental condition - Guidance for choosing - Part 2: Polymer materials Status: Valid GB/T 20644.2: Historical versions
Basic dataStandard ID: GB/T 20644.2-2025 (GB/T20644.2-2025)Description (Translated English): Special environmental condition - Guidance for choosing - Part 2: Polymer materials Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: A21 Classification of International Standard: 19.040 Word Count Estimation: 14,143 Date of Issue: 2025-08-01 Date of Implementation: 2026-02-01 Older Standard (superseded by this standard): GB/T 20644.2-2006 Issuing agency(ies): State Administration for Market Regulation, Standardization Administration of China GB/T 20644.2-2025: Special environmental condition - Guidance for choosing - Part 2: Polymer materials---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/GBT20644.2-2025 ICS 19.040 CCSA21 National Standard of the People's Republic of China Replaces GB/T 20644.2-2006 Selection Guidelines for Special Environmental Conditions Part 2.Polymer materials Part 2.Polymer materials Released on August 1, 2025 Implementation on February 1, 2026 State Administration for Market Regulation The National Standardization Administration issued Table of ContentsPreface III Introduction IV 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Requirements of the use environment for polymer materials 1 5 Selection of polymer materials 1 6 Selection of test evaluation items 2 7 Selection of test methods 2 Appendix A (Informative) Non-biodegradable plastic materials commonly used under special environmental conditions 3 Appendix B (Informative) Commonly used biodegradable plastics under special environmental conditions 5 Appendix C (Informative) Commonly used rubber materials under special environmental conditions 6 References 7 Table 1 Evaluation items of polymer materials 2 Table A.1 Commonly used non-biodegradable plastic materials under special environmental conditions 3 Table B.1 Commonly used biodegradable plastic materials under special environmental conditions 5 Table C.1 Commonly used rubber materials under special environmental conditions 6 Preface This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents" Drafting. This document is Part 2 of GB/T 20644 "Guidelines for the selection of special environmental conditions". GB/T 20644 has been published as follows part. --- Part 1.Protection of metal surfaces; --- Part 2.Polymer materials. This document replaces GB/T 20644.2-2006 "Guidelines for selection of special environmental conditions Part 2.Polymer materials" and Compared with GB/T 20644.2-2006, in addition to structural adjustments and editorial changes, the main technical changes are as follows. a) The content of "scope" has been changed to include special environmental conditions such as humid heat, humid ocean, and cold (see Chapter 1,.2006 edition). Chapter 1); b) Added “Terms and Definitions” (see Chapter 3); c) Deleted “Classification of Polymer Materials” (see Chapter 3 of the.2006 edition); d) Deleted “Classification of Use Environment” (see Chapter 4 of the.2006 edition); e) The content of "Requirements for Polymer Materials in the Use Environment" has been modified (see Chapter 4, Chapter 5 of the.2006 edition); f) The content of Table 1 has been modified, and some evaluation items have been added (see Table 1, Table 1 of the.2006 edition); g) Added the content of “Biodegradation Test” (see 7.3). Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document is proposed and coordinated by the China Electrical Equipment Industry Association. This document was drafted by. China Electric Power Research Institute Co., Ltd., Shenzhen Metrology and Quality Inspection Institute, Beijing Machinery Industry Corporation Institute of Electrical Engineering and Economics, China Southern Power Grid Integrated Energy Co., Ltd., Tsinghua University Shenzhen International Graduate School, Shenzhen INVT Dongfeng Automobile Drive Technology Co., Ltd., Shenzhen Polytechnic, AMETEK Trading (Shanghai) Co., Ltd., Shenzhen Customs Industrial Products Inspection Technology Co., Ltd. Technology Center, Wuxi Suoya Te Testing Equipment Co., Ltd., Shenzhen Power Supply Bureau Co., Ltd., Beijing Academy of Science and Technology Analysis and Testing Institute (Beijing Physical and Chemical Analysis and Testing Center), Beijing University of Science and Technology, China Special Aircraft Research Institute, General Machinery Key Core Basic Parts Innovation Center Power Science Research Institute of State Grid Corporation of China (Anhui), Hainan Power Grid Co., Ltd., and State Grid Fujian Electric Power Co., Ltd. Research Institute. The main drafters of this document are. Fu Yonggao, Zhang Bin, Zhen Hanyu, Zhu Chen, Li Da, Wang Xilin, Gao Jun, Bai Shaotao, Cao Lingling, Qin Jian, Zhou Zhongming, Lü Qishen, Gao Xia, Cheng Xuequn, Mu Xianlian, Du Bin, Chen Lincong, Xia Xiaojian, Jia Zhidong, Wang Jianfeng, and Yan Kanghua. The previous versions of this document and the documents it replaces are as follows. ---First published in.2006 as GB/T 20644.2-2006; ---This is the first revision.introductionGB/T 20644 "Guidelines for the Selection of Special Environmental Conditions" covers my country's dry heat, dry hot desert, plateau, humid heat, humid hot ocean, cold, etc. 6 special environmental conditions. Currently, GB/T 20644 consists of two parts. --- Part 1.Metal surface protection. The purpose is to give special environments such as dry heat, dry hot desert, plateau, humid heat, humid hot ocean, cold, etc. Guidelines for the selection of metal surface protection under certain conditions; --- Part 2.Polymer materials. The purpose is to give special environmental conditions such as dry heat, dry hot desert, plateau, humid heat, humid hot ocean, cold, etc. Guidelines for the selection of polymer materials under certain conditions. Selection Guidelines for Special Environmental Conditions Part 2.Polymer materials 1 Scope This document gives the environmental conditions for polymers used in special environmental conditions such as dry heat, dry hot desert, plateau, humid hot ocean, humid heat, cold, etc. Material requirements, selection of polymer material types, selection of test evaluation items, selection of test methods, etc. This document is applicable to polymer materials such as plastics, rubber, and coatings, among which plastics include biodegradable plastics and non-biodegradable plastics. 2 Normative references The contents of the following documents constitute the essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document. GB/T 3681.2 Plastics test methods for exposure to solar radiation Part 2.Direct natural weathering and exposure behind window glass Weathering GB/T 9276 Test method for natural weather exposure of coatings GB/T 20625-2024 Terminology for special environmental conditions GB/T 20643.3-2025 Environmental test methods for special environmental conditions Part 3.Artificial simulation test methods and guidelines Molecular Materials GB/T 22047 Determination of the ultimate aerobic biodegradability of plastic materials in soil by measuring the oxygen demand in a closed respirometer or Method for determining released carbon dioxide 3 Terms and Definitions The terms and definitions defined in GB/T 20625-2024 apply to this document.4 Requirements of the use environment for polymer materialsThe requirements of the use environment for polymer materials are as follows. ---Polymer materials used in dry heat and dry hot desert environments should be resistant to light aging, high temperature and low temperature, and have good adaptability to temperature changes. Materials; ---The polymer materials used in plateau environments should be made of materials with good light aging resistance, low temperature resistance and temperature change adaptability, or materials with added Materials with light stabilizers; ---Polymer materials used in hot and humid marine environments should be resistant to light aging, heat and humidity, and mildew; ---Polymer materials used in cold environments should be selected from materials with high low-temperature toughness and good adaptability to temperature changes; ---While meeting the performance requirements of polymer materials in different environments, materials with good biodegradability should be selected. 5.Selection of polymer materials 5.1 Selection of plastic type Under special environmental conditions, commonly used non-biodegradable plastics are shown in Appendix A, and commonly used biodegradable plastics are shown in Appendix B. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 20644.2-2025_English be delivered?Answer: Upon your order, we will start to translate GB/T 20644.2-2025_English as soon as possible, and keep you informed of the progress. 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