GB/T 20991-2024Foot protection - Test methods for footwear (English PDF)

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.

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)