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GB/T 20991-2024 English PDF

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GB/T 20991-2024: Foot protection - Test methods for footwear
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GB/T 20991: Evolution and historical versions

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GB/T 20991-2024English1959 Add to Cart 10 days [Need to translate] Foot protection - Test methods for footwear Valid GB/T 20991-2024
GB/T 20991-2007English1749 Add to Cart 10 days [Need to translate] Personal protective equipment -- Test methods for footwear Valid GB/T 20991-2007

PDF similar to GB/T 20991-2024


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Basic data

Standard ID GB/T 20991-2024 (GB/T20991-2024)
Description (Translated English) Foot protection - Test methods for footwear
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard C73
Classification of International Standard 13.340.50
Word Count Estimation 98,911
Date of Issue 2024-12-31
Date of Implementation 2026-01-01
Older Standard (superseded by this standard) GB/T 20991-2007
Issuing agency(ies) State Administration for Market Regulation, China National Standardization Administration

GB/T 20991-2024: Foot protection - Test methods for footwear

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 13.340.50 CCSC73 National Standard of the People's Republic of China Replace GB/T 20991-2007 Test methods for foot protection shoes Released on 2024-12-31 2026-01-01 implementation State Administration for Market Regulation The National Standardization Administration issued

Table of Contents

Preface III 1 Scope 1 2 Normative references 1 3 Terms and Definitions 2 4 General requirements 2 4.1 Sampling 2 4.2 Adjustment 4 4.3 Test requirements 4 4.4 Test Report 4 5 Test methods for finished shoes 5 5.1 Ergonomic requirements 5 5.2 Determination of the bonding strength between the upper and outsole/the bonding strength between the outsole and the middle layer 6 5.3 Determination of the size of the protective toe cap 9 5.4 Determination of impact resistance 12 5.5 Determination of pressure resistance 18 5.6 Features of Protecting Packet Headers 19 5.7 Determination of leak-proofness 20 5.8 Determination of the size of the puncture-proof pad 20 5.9 Determination of the puncture resistance of metal anti-puncture pad shoes 21 5.10 Determination of the puncture resistance of non-metallic anti-puncture pad shoes 24 5.11 Characteristics of puncture-proof pads 27 5.12 Determination of folding resistance of puncture-proof pads 28 5.13 Determination of resistance 30 5.14 Determination of anti-slip properties 31 5.15 Determination of thermal insulation 32 5.16 Determination of cold resistance 34 5.17 Determination of energy absorption in the shoe seat area 35 5.18 Determination of waterproofness of finished shoes. water tank test 37 5.19 Determination of waterproofness of finished shoes. folding machine test 38 5.20 Determination of impact resistance of metatarsal protection devices 40 5.21 Determination of ankle protection dimensions 43 5.22 Determination of the cushioning energy of ankle protection materials incorporated into the upper 45 5.23 Determination of the size of the cut protection area 46 5.24 Determination of cut resistance 47 5.25 Determination of the wear resistance of anti-wear toe caps 48 5.26 Determination of joint strength 48 6 Measurement methods for uppers, linings and tongues 48 6.1 Determination of shoe upper thickness 48 6.2 Determination of shoe upper height 49 6.3 Determination of tear strength of upper/lining/tongue 50 6.4 Determination of tensile properties of upper materials 50 6.5 Determination of folding resistance of shoe upper 51 6.6 Determination of water vapor permeability (WVP) 54 6.7 Determination of water vapor absorption (WVA) 57 6.8 Determination of the water vapor coefficient (WVC) 59 6.9 Determination of pH value 59 6.10 Determination of hydrolysis resistance of shoe uppers 60 6.11 Determination of hexavalent chromium content 60 6.12 Determination of abrasion resistance of linings and insoles 60 6.13 Determination of water permeability and water absorption of shoe uppers 63 7 Test methods for insoles and insoles 65 7.1 Determination of inner bottom thickness 65 7.2 Determination of water absorption and water desorption of insoles and/or insoles 65 7.3 Determination of insole wear resistance 67 8 Test methods for outsoles 68 8.1 General Principles68 8.2 Determination of outer sole dimensions 68 8.3 Determination of tear strength of outsole 71 8.4 Determination of wear resistance of outsole 72 8.5 Determination of shoe rigidity 72 8.6 Determination of folding resistance of outsole 74 8.7 Determination of hydrolysis resistance of outsole 77 8.8 Determination of oil resistance 80 8.9 Determination of thermal contact resistance 81 Appendix A (Normative) Requirements and test methods for plastic clay cylinders 84 A.1 Requirement 84 A.2 Static Test 84 A.3 Dynamic Test 85 Appendix B (Informative) Evaluation of shoes during thermal insulation testing 87 B.1 General Principles87 B.2 Basis for evaluation of shoe condition after thermal insulation test 87 References 90

Foreword

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 replaces GB/T 20991-2007 "Test methods for personal protective equipment footwear". Compared with GB/T 20991-2007, In addition to structural adjustments and editorial changes, the main technical changes are as follows. --- Added the term and definition of "anti-wear toe cap" (see 3.1); --- Changed the sampling and adjustment requirements (see 4.1, 4.2, Chapter 4 of the.2007 edition); --- Deleted the test performance classification in Table 1 (see Table 1 of the.2007 edition); --- Changed the samples and test specimen quantities required for some tests in Table 1 (see Table 1, Table 1 of the.2007 edition); --- Added test requirements (see 4.3); --- Added relevant requirements for test reports (see 4.4, 5.1.3, 5.2.5, 5.3.3, 5.4.4, 5.5.4, 5.6.3, 5.7.4, 5.8.3, 5.9.4, 5.10.5, 5.11.3, 5.12.4, 5.13.5, 5.14.3, 5.15.4, 5.16.4, 5.17.4, 5.18.5, 5.19.5, 5.20.4, 5.21.3, 5.22.5, 5.23.3, 5.24.3, 5.25.3, 5.26.3, 6.1.3, 6.2.3, 6.3.3, 6.4.3, 6.5.3, 6.6.6, 6.7.5, 6.8.2, 6.9.3, 6.10.3, 6.11.3, 6.12.5, 6.13.5, 7.1.3, 7.2.5, 7.3.5, 8.2.2.2, 8.2.3.2, 8.2.4.2, 8.3.3, 8.4.3, 8.5.5, 8.6.5, 8.7.4, 8.8.3, 8.9.4); --- Changed the sampling requirements in the ergonomic requirements, the postures to be used in the test and the questionnaire for evaluating the ergonomic requirements (see 5.1.1, 5.1.2, 5.1 of the.2007 edition); --- Changed the relevant requirements for test equipment (see 5.2.2, 5.4.1, 5.5.1, 5.7.1, 5.9.1, 5.10.2, 5.16.1, 5.17.1, 5.19.2, 5.20.1, 6.6.2, 6.7.2, 6.12.2, 6.13.2, 7.2.2, 7.3.2, 8.5.2, 8.6.2, 5.2.2, 5.4.1, 5.5.1, 5.7.1 of the.2007 edition, 5.8.2.1, 5.13.1, 5.14.1, 5.15.2, 5.16.1, 6.6.2, 6.7.2, 6.12.2, 6.13.2, 7.2.2, 7.3.2, 8.4.1.1, 8.4.2.1); --- Added sampling and adjustment requirements (see 5.2.3, 5.3.1, 5.4.2, 5.5.2, 5.6.1, 5.7.2, 5.8.1, 5.9.2, 5.10.3, 5.11.1, 5.12.2, 5.13.3, 5.14.1, 5.15.2, 5.16.2, 5.17.2, 5.18.3, 5.19.3, 5.20.2, 5.21.1, 5.22.3, 5.23.1, 5.24.1, 5.25.1, 5.26.1, 6.1.1, 6.2.1, 6.3.1, 6.4.1, 6.5.1, 6.6.3, 6.7.3, 6.9.1, 6.10.1, 6.11.1, 6.12.3, 6.13.3, 7.1.1, 7.2.3, 7.3.3, 8.2.1, 8.3.1, 8.4.1, 8.5.3, 8.6.3, 8.7.2, 8.8.1, 8.9.2); --- Added the determination of the width of the protective cap hem (see 5.3.2.2); --- Added the calculation method of impact velocity for impact resistance (see 5.4.3.3); --- Changed the test requirements for the characteristics of the protective cap, and added the test requirements and test methods for the stability of the non-metallic protective cap (see 5.6,.2007 edition 5.6); --- Changed the pressure value requirements in the leakproofness test (see 5.7.3, 5.7.3 of the.2007 edition); --- Changed the size requirements of metal anti-puncture test nails and the provisions for replacing test nails (see 5.9.1.2, 5.8.2.1.2 of the.2007 edition); --- Added the puncture resistance test method for non-metallic puncture-resistant insulated shoes (see 5.10); --- Added the test of puncture-proof pad characteristics (see 5.11); --- Changed the requirements for the test environment in the determination of resistance (see 5.13.4, 5.10.3.3 of the.2007 edition); --- Deleted the determination of electrical insulation (see 5.11 of the.2007 edition); --- Added the determination of anti-slip properties (see 5.14); --- Changed the equipment example of the cold resistance determination method (see 5.16.1, 5.13.1 of the.2007 edition) --- Changed the machine test method for the waterproofness test of finished shoes (see 5.19, 5.15.2 of the.2007 edition); --- Added the determination of ankle protection device size (see 5.21); --- Added the determination of the size of the anti-cutting protection area (see 5.23); --- The test method for cut resistance has been changed (see 5.24, 6.14 of the.2007 edition); --- Added the determination of wear resistance of anti-wear toe cap (see 5.25); --- Added the determination of joint strength (see 5.26); --- Changed the test method for upper thickness (see 6.1, 6.1 of the.2007 edition); --- Changed the sampling requirements for tear strength of upper/lining/tongue (see 6.3, 6.3 of the.2007 edition); --- Changed the sampling requirements for tensile properties of upper materials (see 6.4.2.1, 6.4.2.2 of the.2007 edition); --- Changed the calculation formula of water vapor permeability (WVP) (see 6.6.5, 6.6.5 of the.2007 edition); --- Changed the test method for determination of hexavalent chromium content (see 6.11, 6.11 of the.2007 edition); --- Changed the evaluation method for the wear resistance of linings/insoles (see 6.12.4.3, 6.12.6 of the.2007 edition); --- Changed the evaluation method for the determination of insole wear resistance (see 7.3.4.3, 7.3.6 of the.2007 edition); --- Added general principles for outsole test methods (see 8.1); --- Changed the test method for outsole thickness and tread height (see 8.2.3, 8.1.2 of the.2007 edition); --- Added the determination of the pattern design in the dimple area (see 8.2.4); --- Changed the sample thickness requirements for outsole hydrolysis test (see 8.7.3.1, 8.5.3 of the.2007 edition); --- Deleted other specifications for cotton canvas (see Appendix A of the.2007 edition); --- Added requirements and test methods for plastic clay cylinders (see Appendix A). This document is modified to adopt ISO 20344.2021 "Test methods for personal protective equipment footwear". This document has the following structural adjustments compared to ISO 20344.2021. ---5.23 corresponds to 5.23.2 of ISO 20344.2021; ---5.24 corresponds to 5.23.3 of ISO 20344.2021; ---5.25 corresponds to 5.24 of ISO 20344.2021; ---5.26 corresponds to 5.25 of ISO 20344.2021; --- Appendix B corresponds to Appendix A of ISO 20344.2021. The technical differences between this document and ISO 20344.2021 and their reasons are as follows. --- Changed the sampling requirements in Table 1 (including sample type and quantity, specimen type and quantity for each type of sample, see Table 1, ISO 20344.2021 Table 1) to increase operability; --- Deleted the uncertainty requirements in some test reports (see 4.4, 5.1.3, 5.7.4, 5.10.5, 5.11.3, 5.12.3, 5.12.3, 5.18.5, 5.19.5, 6.5.3, 6.10.3, 6.12.5, 8.9.4), to eliminate ambiguity; --- Added the test posture requirements and evaluation questionnaire content in the ergonomic requirements (see 5.1.2) to adapt to the actual situation in my country and expand Scope of application of the test method; --- The test method for the size of the protective header has been changed (see 5.3.2, 5.3.2 of ISO 20344.2021) to adapt to the technical requirements of my country parts, increasing operability; --- Changed the requirements for impact resistance tester equipment (see 5.4.1.1, 5.4.1.1 of ISO 20344.2021) to increase operability; --- Added pressure resistance pressure tester equipment requirements (see 5.5.1) to increase operability; --- Added the test nail requirements for the puncture resistance of metal puncture-resistant shoes (see 5.9.1.2) to increase operability; --- Added PS and PL type test nail requirements for non-metallic puncture-proof insulated shoes (see 5.10.2.2, 5.10.2.3), Operability; --- Added the test method for the puncture-proof pad characteristics (see 5.11.2) to adapt to my country's technical requirements and increase operability; --- Added equipment requirements for folding resistance test of puncture-resistant pads (see 5.12.1) to meet the technical requirements of my country; --- Changed the test method for folding resistance of puncture-resistant pads (see 5.12.3, 5.12.2 of ISO 20344.2021) to increase operability; --- Added the water tank filling requirements for mixed shoes in the waterproof folding machine test of finished shoes, that is, the minimum height requirement of H (see 5.19.4.2, Table 9), increase operability; --- The test method for seam strength has been changed (see 5.26.2, 5.25.2 of ISO 20344.2021) to adapt to my country's technical requirements parts, increasing operability; --- The determination of the water vapor permeability area of materials (see 6.1.2 of ISO 20344.2021) has been deleted to adapt to the technical conditions of my country; --- The test method for upper thickness has been changed (see 6.1.2, 7.3.2.3, 6.1.2, 7.3.2.3 of ISO 20344.2021) to adapt to my country Technical conditions to increase operability; --- The test method for tear strength of upper/lining/tongue has been changed (see 6.3.2, 6.3.2 of ISO 20344.2021) to adapt to my country Technical conditions to increase operability; --- The test method for tensile properties of leather (see 6.4.2.1, 6.4.2.1 of ISO 20344.2021) has been changed to adapt to my country's technology Conditions, increase operability; --- Changed the test equipment requirements for the tear strength of rubber materials (see 6.4.2.2, 6.4.2.2 of ISO 20344.2021) to adapt to our The technical conditions of the country increase operability; --- The test method for tensile properties of polymeric materials (see 6.4.2.3, 6.4.2.3 of ISO 20344.2021) has been changed to adapt to my country's Technical conditions, increase operability; --- Changed the requirements for the folding machine and sample preparation method in the water vapor permeability test (see 6.6.2.10, 6.6.4.1, ISO 20344.2021 6.6.4) to adapt to my country's technical conditions and increase operability; --- Added the water vapor permeability calculation formula (see 6.6.5) to increase operability; --- The test method for pH value has been changed (see 6.9.2, 6.9.2 of ISO 20344.2021) to increase operability; --- Added the test method for hydrolysis resistance of upper (see 6.10.2) to increase operability; --- Changed the determination method and test report requirements for hexavalent chromium content (see 6.11.2, 6.11.3, 6.11.2, ISO 20344.2021 6.11.3), increase operability; --- Changed the test equipment requirements for abrasion resistance of linings and insoles (see 6.12.2, 6.12.2 of ISO 20344.2021) to adapt to my country Technical conditions to increase operability; --- Changed the test equipment requirements for water absorption of insoles and/or insoles (see 7.2.2.1, 7.2.2.1 of ISO 20344.2021) to apply In response to my country's technical conditions, increase operability; --- Changed the test equipment requirements in the insole abrasion resistance test (see 7.3.2.1, 7.3.2.1 of ISO 20344.2021) to adapt to our The technical conditions of the country increase operability; --- The test method for outsole tear strength has been changed (see 8.3.2, 8.3.2 of ISO 20344.2021) to adapt to my country's technical requirements parts, increasing operability; --- The test method for outsole wear resistance has been changed (see 8.4.2, 8.4.2 of ISO 20344.2021) to adapt to my country's technical requirements parts, increasing operability; --- Added requirements and test methods for plastic clay cylinders (see Appendix A) to adapt to my country's technical conditions and increase operability. The following editorial changes were made to this document. --- In order to coordinate with the existing standards, the name of the standard is changed to "Test Methods for Foot Protection Footwear"; --- The informative Appendix B “Footwear sizes” of ISO 20344.2021 has been deleted. 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 by the Ministry of Emergency Management of the People's Republic of China. This document is under the jurisdiction of the National Technical Committee for Standardization of Personal Protective Equipment (SAC/TC112). This document was drafted by. Shanghai Institute of Work Safety Science, Beijing Academy of Science and Technology Urban Safety and Environmental Science Research Institute Institute, Jiangsu Special Safety Protection Product Quality Supervision and Inspection Center, Guangdong Product Quality Supervision and Inspection Institute, Shanghai Baiji Technology Group Ltd., Xumei Holding Group Co., Ltd., Dongguan Hengyu Instrument Co., Ltd., Gaomi Yuniao Shoe Material Co., Ltd., Gaotewell Scientific Instrument Equipment (Qingdao) Co., Ltd. and Sinosteel Wuhan Safety and Environmental Protection Research Institute Co., Ltd. The main drafters of this document are. Jiang Ruiliang, Long Xianmiao, Gu Haiyan, Han Jianjian, Hu Zhanfeng, Xiang Youchun, Liu Long, Li Jing, Xu Ming, Chen Yan, Wei Guozheng, Li Weihong, Yao Tao, and Cheng Jun. The previous versions of this document and the documents it replaces are as follows. ---First published in.2007 as GB/T 20991-2007; ---This is the first revision. Test methods for foot protection shoes

1 Scope

This document describes the test methods for footwear used in foot protection equipment. This document applies to safety shoes, chemical resistant shoes, and other footwear (boots) used for personal protection.

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 308.1 Rolling bearing balls Part 1.Steel balls (GB/T 308.1-2013, ISO 3290-1.2008, NEQ) GB/T 528-2009 Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber (ISO 37.2005, IDT) GB/T 529-2008 Determination of tear strength of vulcanized rubber or thermoplastic rubber (trouser-shaped, right-angled and crescent-shaped test specimens) (ISO 34- 1.2004,MOD) GB/T 2411-2008 Plastics and hard rubber - Determination of indentation hardness (Shore hardness) using a durometer (ISO 868.2003, IDT) GB/T 2703-2017 Footwear terminology (ISO.19952.2005, NEQ) GB/T 2941-2006 Rubber physical test methods - General procedures for specimen preparation and conditioning (ISO 23529.2004, IDT) GB/T 3903.33-2019 Test methods for insoles and insoles of footwear - Water absorption and desorption rate (ISO 22649.2016, IDT) GB/T 3903.43-2019 Test methods for uppers, linings and insoles of footwear - Seam strength (ISO 17697.2016, IDT) GB/T 9867-2008 Determination of wear resistance of vulcanized rubber or thermoplastic rubber (rotating roller abrasion machine method) (ISO 4649. 2002, IDT) GB/T 16825.1 Inspection and calibration of static uniaxial testing machines for metallic materials Part 1.Tension and/or compression testing machines Inspection and calibration of force measuring systems GB 21148 Foot protection safety shoes (GB 21148-2020, ISO 20345.2011, NEQ) GB/T 21196.1-2007 Textiles - Determination of the abrasion resistance of fabrics by the Martindale method - Part 1.Martindale abrasion tester (ISO 12947-1.1998,MOD) GB/T 22807-2019 Chemical tests on leather and fur - Determination of hexavalent chromium content. Spectrophotometric method (ISO 17075-1. 2017,MOD) GB 24541-2022 Hand protection gloves for protection against mechanical hazards GB/T 28287 Test method for anti-slip performance of footwear (GB/T 28287-2012, ISO 13287.2006, MOD) GB/T 28288 Foot protection - Toe protection caps and puncture-proof pads (GB/T 28288-2012, EN12568.2010, MOD) Note. EN12568-2010 is completely replaced by ISO 22568 (all parts), and the contents cited in GB/T 28288 are the same as those cited in ISO 22568 (all parts) There is no technical difference in the content. GB/T 38402-2019 Chemical tests on leather and fur - Determination of hexavalent chromium content. Chromatographic method (ISO 17075-2.2017, MOD) GB/T 40920-2021 Leather color fastness test - Reciprocating rubbing color fastness (ISO 11640.2018, MOD) HG/T 2581.1-2022 Rubber or plastic coated fabrics - Determination of tear resistance - Part 1.Constant tear rate method (ISO 4674-1. 2016,MOD)

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