Journal of Textile Research ›› 2024, Vol. 45 ›› Issue (03): 163-168.doi: 10.13475/j.fzxb.20221005201

• Apparel Engineering • Previous Articles     Next Articles

Analysis of newly revised national standard for chemical protective clothing

YANG Guang1,2, YANG Xiaobing1,2(), LI Li1,2, YAO Zhifeng3, ZHOU Chuan1,2, ZHANG Mingming3   

  1. 1. State Key Laboratory of NBC Protection for Civilian, Beijing 100191, China
    2. Beijing Key Laboratory of Ambient Particles Health Effects and Prevention Techniques, Beijing 100191, China
    3. China Academy of Safety Science and Technology, Beijing 100012, China
  • Received:2022-12-28 Revised:2023-12-18 Online:2024-03-15 Published:2024-04-15
  • Contact: YANG Xiaobing E-mail:xbyoung2001@163.com

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Abstract:

Objective This paper aims to clarify the situation after the revision of the national standard for chemical protective clothing to enhance correct understanding the new specifications of chemical protective clothing. It is expected that this work will help engineers make scientific and reasonable selection of chemical protective clothing from the perspectives of protective performance and service performance based on the hazard degree of chemicals in different job sites, to ensure the personal health and life and property safety of users.

Method During developing the new national standard of chemical protective clothing in China, references were made to some foreign standards of chemical protective clothing, including International Organization for Standardization (ISO), European Committee for Standardization (CEN) and National Fire Protection Association (NFPA). Focusing on the changes in the revised GB 24539—2021 "Protective Clothing: Chemical Protective Clothing", this paper interprets the standard from the aspects of classification, performance requirements and test methods.

Results It is found that GB 24539—2021 integrated GB 24539—2009 "Protective Clothing: General Technical Requirements for Chemical Protective Clothing", GB 24540—2009 "Protective Clothing: Chemical Protective Clothing against Acids and Alkalis" and GB/T 29511—2013 "Protective clothing: Chemical Protective Clothing for Solid Particles", and the classification of chemical protective clothing was greatly adjusted and updated by deleting the non-airtight chemical protective clothing-ET, and by adding the airtight chemical protective clothing, limited liquid spray chemical protective clothing and woven material liquid acid and alkali chemical protective clothing. Accordingly, the performance requirements were also changed greatly, these mainly including the overall protective performance of clothing, the protective performance of clothing fabrics and the physical and chemical properties of clothing fabrics. Among them, liquid leakage performance in the overall protective performance of clothing was deleted, and inward leakage rate, limited liquid-tight spray performance and practical performance were added. New requirements for the protective performance of clothing fabrics were put forward in combination with various types of protective clothing which were reorganized. The grading indexes of wear resistance and flex resistance for physical and chemical properties of clothing fabrics were adjusted to better suit the actual situation of most protective clothing fabrics at present. Test methods in GB 24539—2021 mostly followed the test methods in the previous relevant standards, but they were also improved and perfected accordingly, including the sample pretreatment conditions and test environment conditions, the test method of inward leakage rate of chemical protective clothing, the test method of liquid tightness of chemical protective clothing, the test method of wear resistance of chemical protective clothing fabrics and the test method of bending resistance. Among them, the sample pretreatment conditions, and test environment conditions were added in the new revision which had not been unified and made clear in the previous standards. The test method of inward leakage rate of chemical protective clothing is a new content in this standard revision to evaluate the overall protective performance of airtight chemical protective clothing more comprehensively. The liquid tightness test of chemical protective clothing in the revised standard includes three test methods, which are respectively suitable for the liquid tightness test of jet liquid-tight chemical protective clothing, spray liquid-tight chemical protective clothing and limited liquid spray chemical protective clothing. As for the testing methods for abrasion resistance and flex resistance of chemical protective clothing fabrics, the qualitative evaluation method of visual observation was improved and two quantitative evaluation methods, i.e., the pressure tank method and hydrostatic pressure method, were added.

Conclusion The revised national standard of chemical protective clothing will play an important role in promoting market development, improving product quality, and protecting users' personal health and life safety.

Key words: national standard, protective clothing, chemical protective clothing, protective performance, wear resistance

CLC Number: 

  • TS941.731

Tab.1

Classification comparison of chemical protective clothing before and after revision of GB 24539"

类型 类型代号
GB 24539—2009 GB 24539—2021
气密型化学防护服-ET 1-ET 1-ET
气密型化学防护服 / 1
非气密型化学防护服-ET 2-ET /
喷射液密型化学防护服-ET 3a-ET 3-ET
喷射液密型化学防护服 3a 3
泼溅液密型化学防护服 3b 4
固体颗粒物化学防护服 4 5
有限泼溅化学防护服 / 6
织物酸碱类化学防护服 / 7

Tab.2

Classification of chemical protective clothing of CEN and ISO"

类型 标准编号
CEN ISO
气密型化学
防护服-ET		 EN 943-2:2019 ISO 17723-1:2019
气密型化学防护服 EN 943-1:2015/
A1:2019		 ISO 16602:2007/
A1:2012
非气密型
化学防护服		 / ISO 16602:2007/
A1:2012
液密型化学
防护服		 EN 14605:2005/
A1:2009		 ISO 16602:2007/
A1:2012
泼溅液密型
化学防护服		 EN 14605:2005/
A1:2009		 ISO 16602:2007/
A1:2012
固体颗粒物
化学防护服		 EN 13982-1:2004/
A1:2010		 ISO 16602:2007/
A1:2012
有限泼溅
化学防护服		 EN 13034:2005/
A1:2009		 ISO 16602:2007/
A1:2012

Tab.3

Comparison of permeability requirements of clothing fabrics before and after revision of GB 24539"

防护服
类型		 GB 24539—2009 GB 24539—2021
化学品种类数 性能等级 化学品种类数 性能等级
1-ET 15 ≥3 15 ≥3
1 / / 12 ≥3
3-ET 1 ≥3 ≥12 ≥2
3 1 ≥3 1 ≥3
4 1 ≥1 1 ≥1

Tab.4

Grading comparison of wear resistance of clothing fabrics before and after revision of GB 24539"

耐磨损
性能级别		 循环次数
GB 24539—2009 GB 24539—2021
1 >10 >10
2 >100 >40
3 >500 >100
4 >1 000 >400
5 >1 500 >1 000
6 >2 000 >2 000

Tab.5

Grading comparison of flexural resistance of clothing fabrics before and after revision of GB 24539"

耐屈挠性能
级别		 循环次数
GB 24539—2009 GB 24539—2021
1 >1 000 >500
2 >2 500 >1 250
3 >5 000 >3 000
4 >15 000 >8 000
5 >40 000 >20 000
6 >100 000 >50 000

Fig.1

Layout of chemical protective clothing inward leakage rate testing (sodium chloride) device"

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