Standard No.:	GB/T 41006-2021
English Name:	General technical requirements for polyurethane synthetic leather used for vehicle
Chinese Name:	汽车用聚氨酯合成革通用技术条件
Chinese Classification:	Y47    Artificial leathers and synthetic leathers
Professional Classification:	GB    National Standard
ICS Classification:	59.080.40 59.080.40    Coated fabrics 59.080.40
Issued by:	SAMR; SAC
Issued on:	2021-12-31
Implemented on:	2022-7-1
Status:	valid
Language:	English
File Format:	PDF
Word Count:	6000 words
Price(USD):	180.0
Delivery:	via email in 1~3 business day

1 Scope This document specifies the general technical requirements, test methods and inspection rules for polyurethane synthetic leather for automobiles. This document applies to polyurethane synthetic leather for automobiles made of cloth base, polyurethane resin and other main raw materials, by wet or dry polyurethane coating and post-processing. 2 Normative references The contents of the following documents constitute the essential provisions of this document through the normative references in the text. Among them, note the date of the reference document, only the corresponding version of the 8 issues apply to this document; not note the 8 issues of the reference document, its latest version (including all the revision of the list) applies to this document. GB/T 250-2008 Colour fastness test for textiles Grey samples for assessing discolouration Card. GB/T2912.1-2009 Determination of formaldehyde in textiles Part 1: Free and hydrolysed formaldehyde (water extraction method) GB/T2918-2018 Standard environment for conditioning and testing of plastic specimens GB8410 Combustion characteristics of automotive interior materials GB/T 16578.1-2008 Determination of the tear resistance of plastic films and sheets Part 1: Pant tear method GB/T 19942-2019 Leather and fur Chemical test Determination of prohibited azo dyes GB/T 38465-2020 Determination of the cold resistance of synthetic leather GB/T 38612-2020 Test methods for artificial leather and synthetic leather Determination of tensile load and elongation at break QB/T 2537-2001 Colour fastness test for leather Reciprocating rubbing colour fastness QB/T 2714-2018 Determination of fastness to fracture in physical and mechanical tests on leather QB/T 2726-2005 Determination of abrasion resistance in physical and mechanical tests on leather QB/T 4043 -2010 Polychlorinated ethylene artificial leather for automobiles QB/T 4671-2014 Test method for synthetic leather Determination of resistance to hydrolysis QB/T 4873 -2015 Synthetic leather test method Laboratory light exposure method QB/T 5068 -2017 Synthetic leather test method for the determination of fogging properties QB/T 5157- -2017 Test method for synthetic leather of artificial leather Determination of colour migration QB/T 5354- 2018 Test method for synthetic leather: Determination of volatile organic compounds. QB/T 5447- -2019 Test method for synthetic leather, determination of odour QC/T 941- 2013 Test method for the determination of mercury in automotive materials QC/T 942- 2013 Test method for hexavalent chromium in automotive materials QC/T 943- 2013 Test methods for lead and cadmium in automotive materials 3 Terminology and definitions There are no terms and definitions in this document that need to be defined. 4 Technical requirements The physical and chemical properties shall conform to the provisions of Table 1. 5 Test methods 5.1 Cutting of specimens A sample of each batch shall be cut along the longitudinal direction to meet all the requirements of the test methods in this chapter. The sample shall be prepared by removing 50 mm of the width at each end of the sample in the transverse direction. 5.2 Conditioning and test environment Unless otherwise specified, the specimen should be GB/T 2918- -2018 in accordance with the provisions of the temperature of 23 C to 2 C, relative humidity of 50% to 10% of the standard environment for state conditioning, the time should not be less than 4h, and in this environment for the test. 5.3 Tensile load and elongation at break The test shall be conducted in accordance with the provisions of method A of GB/T 38612- 2020. 5.4 Tear load Test according to the provisions of GB/T 16578.1- 2008. The test speed is 200 mm/ min and 10 mm/ min, and the test result is the arithmetic mean of the maximum load of three specimens, accurate to 0.1 N. 5.5 Abrasion resistance The test was carried out in accordance with QB/T2726-2005. CS10 grinding wheel, load weight 1000g, equipment friction rotation speed 70r/min, 4000 rpm of friction. At the end of the test, the specimen was removed and the abrasion resistance of the specimen was visually determined according to Table 2. 5.6 Fastness to folding Test according to QB/T2714-2018 in the dry state. 5.7 Hydrolysis resistance Test according to QB/T 4671- 2014, method A, test time 1334 h, after the test according to GB/T 250- 2008 After the test, the fading grade shall be determined according to GB/T 250-2008. 5.8 Cold resistance Test according to the provisions of method A in GB/T38465-2020. 5.9 Chemical media resistance The test shall be carried out in accordance with the provisions of 6.29 of QB/T 4043- 2010. 5.10 Lightfastness The test shall be carried out in accordance with the provisions of test method A in QB/T 4873- 2015, where A2 is selected as the test condition. 5.11 Thermal ageing resistance The test shall be carried out in accordance with the provisions of QB/T 4043- 2010, 6.24. The oven temperature is 100 C to 2 C and the test time is 168 h. After the test, take out the specimen and make the following judgment: Observe the surface changes of the specimen and visually determine the level of discolouration under the standard light source according to GB/T250-2008, with the most serious surface discoloration as the test results. 5.12 Surface colour migration The test shall be conducted in accordance with the provisions of method A of QB/T5157-2017. 5.13 Colour fastness to rubbing Test according to the provisions of QB/T2537-2001. 5.14 Flame resistance Test according to the provisions of GB8410. 5.15 Fogging value Test according to the provisions of method B in QB/T5068-2017. 5.16 Odour Test according to the provisions of condition 4 of Table 1 in QB/T5447-2019. 5.17 Free and hydrolysed formaldehyde Test according to the provisions of GB/T2912.1-2009. 5.18 Decomposable aromatic amine dyes Test according to the provisions of GB/T 19942- 2019. 5.19 Heavy metals 5.19.1 Hexavalent chromium Test according to QC/T942-2013. 5.19.2 Lead Test according to QC/T 943- 2013. 5.19.3 Cadmium Test according to QC/T 943-2013. 5.19.4 Mercury Test according to QC/T941-2013. 5.20 Polybrominated biphenyls and polybrominated diphenyl ethers Test according to QC/T944-2013. 5.21 Volatile organic compounds Test according to the provisions of QB/T5354-2018. 6 Test rules 6.1 Batch quantity Products are accepted in batches. The same - - raw materials. The same - a formula, the same category, the same specification, the same process of continuous production of products for a batch, the number of each batch should not exceed 500 rolls. 6.2 Sampling method One sample shall be taken randomly from each batch. 6.3 Determination Rules If there are unqualified items in the test results, double samples shall be taken from the batch again, and the unqualified items shall be retested, and if still unqualified, the batch shall be unqualified.

1 Scope 2 Normative references 3 Terminology and definitions 4 Technical requirements 5 Test methods 6 Test rules