Detail of GB/T 20991-2024

Introduction of GB/T 20991-2024

GB/T 20991-2024 Foot protection - Test methods for footwear 1 Scope This document specifies the test methods for footwear designed as personal protective equipment. This document is applicable to safety footwear, chemical-resistant footwear, and other types of footwear (boots) intended for personal protective use. 2 Normative references The following documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 308.1 Rolling bearings - Balls - Part 1: Steel balls (GB/T 308.1-2013, ISO 3290-1: 2008, NEQ) GB/T 528-2009 Rubber, vulcanized or thermoplastic - Determination of tensile stress-strain properties (ISO 37: 2005, IDT) GB/T 529-2008 Rubber, vulcanized or thermoplastic - Determination of tear strength (Trouser，angle and crescent test pieces) (ISO 34-1: 2004, MOD) GB/T 2411-2008 Plastics and ebonite - Determination of indentation hardness by means of a durometer (shore hardness) (ISO 868: 2003, IDT) GB/T 2703-2017 Footwear - Vocabulary (ISO 19952: 2005, NEQ) GB/T 2941-2006 Rubber - General procedures for preparing and conditioning test pieces for physical test methods (ISO 23529: 2004, IDT) GB/T 3903.33-2019 Footwear - Test methods for insoles and insocks - Water absorption and desorption (ISO 22649: 2016, IDT) GB/T 3903.43-2019 Footwear - Test methods for uppers, lining and insocks - Seam strength (ISO 17697: 2016, IDT) GB/T 9867-2008 Rubber, vulcanized or thermoplastic - Determination of abrasion resistance using a rotating cylindrical drum device (ISO 4649: 2002, IDT) GB/T 16825.1 Metallic materials - Calibration and verification of static uniaxial testing machines - Part 1: Tension/compression testing machines - Calibration and verification of the force-measuring system GB 21148 Foot protection - Safety footwear (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 testing apparatus (ISO 12947-1: 1998, MOD) GB/T 22807-2019 Leather and fur - Chemical tests - Determination of chromium (VI) content: Colorimetric method (ISO 17075-1: 2017, MOD) GB 24541-2022 Hand protection - Protective gloves against mechanical risks GB/T 28287 Foot protection - Test method for footwear slip resistance (GB/T 28287-2012, ISO 13287: 2006, MOD) GB/T 28288 Foot protection - Toecaps and penetration-resistant inserts (GB/T 28288-2012, EN 12568: 2010, MOD) Note: EN 12568-2010 is fully replaced by ISO 22568 (all parts). There is no technical difference between the referenced content from GB/T 28288 and that from ISO 22568 (all parts). GB/T 38402-2019 Leather and fur - Chemical tests - Determination of chromium (VI) content: Chromatographic method (ISO 17075-2: 2017, MOD) GB/T 40920-2021 Leather - Tests for colour fastness - Colour fastness to cycles of to-and-fro rubbing (ISO 11640: 2018, MOD) HG/T 2581.1-2022 Rubber- or plastics-coated fabrics - Determination of tear resistance - Part 1: Constant rate of tear methods (ISO 4674-1: 2016, MOD) QB/T 2710-2018 Leather - Physical and mechanical tests - Determination of tensile strength and percentage extension (ISO 3376: 2011, MOD) QB/T 2711-2005 Leather - Physical and mechanical tests - Determination of tear load - Double edge tear (ISO 3377-2: 2002, MOD) QB/T 2714-2018 Leather - Physical and mechanical tests - Determination of flex resistance (ISO 5402-1: 2011, MOD) QB/T 2724-2018 Leather - Chemical tests - Determination of pH (ISO 4045: 2008, MOD) 3 Terms and definitions For the purposes of this document, the terms and definitions given in GB 21148, GB/T 2703-2017 and the following apply. 3.1 scuff cap abrasion resistant materials or component to protect against scuff of the upper external toe region during kneeling activities 4 General requirements 4.1 Sampling The minimum number of samples to be tested, together with the minimum number of test pieces taken from each sample, shall be in accordance with Table 1. Where samples are required from each of three sizes, these shall comprise the smallest, middle and largest size of the footwear under test. Where Table 1 does not specify any three sizes of footwear may be used. Wherever necessary to ensure the essential safety requirements, test pieces shall be taken from the whole footwear. If it is not possible to obtain a large enough test piece from the whole footwear, then a sample of the material from which the component has been manufactured may be used instead. This shall be noted in the test report. Table 1 Minimum number of samples and test pieces 4.2 Conditioning All test pieces shall be conditioned in a standard atmosphere of (23±2)°C and (50±5)% RH for a minimum of 24 h before testing, unless otherwise stated in the test method. If the test requires a condition as defined above, it shall be mentioned in the test method. Where the testing in conditioned atmosphere is not possible, the maximum time which shall elapse between removal from the conditioning atmosphere and the start of testing shall not be greater than 10 min, unless otherwise stated in the test method. 4.3 Test requirements When tolerances are not specified in this document (text or figures), a maximum tolerance of ±10% shall be applied. A result shall be reported for each tested size. When several test pieces are tested, at least the worst results with regards to the specification shall be reported unless specified in the test method.

Contents of GB/T 20991-2024

Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 General requirements 4.1 Sampling 4.2 Conditioning 4.3 Test requirements 4.4 Test report 5 Test methods for whole footwear 5.1 Specific ergonomic features 5.2 Determination of upper/outsole and sole interlayer bond strength 5.3 Determination of dimensions of toe cap 5.4 Determination of impact resistance 5.5 Determination of compression resistance 5.6 Behaviour of toe caps 5.7 Determination of leak proofness 5.8 Dimensions of perforation resistant inserts 5.9 Determination of the perforation resistance of footwear with a metallic perforation resistant insert 5.10 Determination of the perforation resistance of footwear with a non-metallic perforation resistant insert 5.11 Behaviour of perforation resistant inserts 5.12 Determination of the flex resistance of perforation resistant inserts 5.13 Determination of electrical resistance 5.14 Determination of footwear slip resistance 5.15 Determination of insulation against heat 5.16 Determination of insulation against cold 5.17 Determination of energy absorption of the seat region 5.18 Determination of resistance to water for completed footwear: trough test 5.19 Determination of resistance to water for whole footwear: flexing machine test 5.20 Determination of impact resistance of a metatarsal protective device 5.21 Determination of the dimension of the ankle protection 5.22 Determination of the shock absorption capacity of ankle protection materials incorporated into the upper 5.23 Determination of cut resistant protective area 5.24 Determination of cut resistance 5.25 Determination of abrasion resistance of scuff caps 5.26 Determination of seam strength 6 Test methods for upper, lining and tongue 6.1 Determination of thickness of upper 6.2 Measurement of the height of the upper 6.3 Determination of tear strength of the upper / lining / tongue 6.4 Determination of the tensile properties of the upper material 6.5 Determination of upper flexing resistance 6.6 Determination of water vapour permeability (WVP) 6.7 Determination of water vapour absorption (WVA) 6.8 Determination of water vapour coefficient (WVC) 6.9 Determination of pH value 6.10 Determination of resistance to hydrolysis of upper 6.11 Determination of chromium VI content 6.12 Determination of abrasion resistance of lining and insock 6.13 Determination of water penetration and water absorption for upper 7 Test methods for insole and insock 7.1 Determination of insole thickness 7.2 Determination of water absorption and desorption of insole and/or insock 7.3 Determination of abrasion resistance of insole 8 Test methods for outsole 8.1 General 8.2 Determination of outsole dimensions 8.3 Determination of tear strength of outsole 8.4 Determination of outsole abrasion resistance 8.5 Determination of footwear rigidity 8.6 Determination of flexing resistance of outsole 8.7 Determination of resistance to hydrolysis of outsole 8.8 Determination of resistance to fuel oil 8.9 Determination of resistance to hot contact Annex A (Normative) Requirements and test methods for modelling clay cylinders Annex B (Informative) Assessment of footwear during testing of thermal behaviour Bibliography