GB/T 40357-2021 English PDFUS$199.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 40357-2021: Hair products - Determination of the permeability of hairpiece to air Status: Valid
Basic dataStandard ID: GB/T 40357-2021 (GB/T40357-2021)Description (Translated English): Hair products - Determination of the permeability of hairpiece to air Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: W59 Word Count Estimation: 10,136 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 40357-2021: Hair products - Determination of the permeability of hairpiece to air---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.Hair products - Determination of the permeability of hairpiece to air ICS 59.080.99 CCS W59 National Standards of People's Republic of China Determination of air permeability of wigs for hair products Released on 2021-08-20 2021-12-01 implementation State Administration of Market Supervision and Administration Issued by the National Standardization Management Committee ForewordThis document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents" Drafting. Please note that some of the contents of this document may involve patents. The issuing agency of this document is not responsible for identifying patents. This document was proposed by the China National Light Industry Council. This document is under the jurisdiction of the National Hair Products Standardization Technical Committee (SAC/TC304). Drafting organizations of this document. Shanghai Institute of Quality Supervision and Inspection Technology, Henan Rebecca Hair Products Co., Ltd., Donghua University, Nanjing Bo Textile Instrument Factory, Xiamen Yinchao Technology Co., Ltd., Xuchang Quality and Technical Supervision Inspection and Testing Center, Henan Textile Product Quality Supervision Inspection Institute, Zhongyuan Institute of Technology, Jiusi Testing Technology (Guangdong) Co., Ltd., Guangdong Limai Testing Technology Co., Ltd., Guangdong Qinghe Technology Co., Ltd. Company, Guangdong Yayin Technology Co., Ltd., Yiwu Riqing Household Products Co., Ltd., Xi’an Kaijinzhe Testing Co., Ltd., Guangdong Haochenwang Technology Co., Ltd. Co., Ltd., Shaanxi Runzheng Testing Technology Co., Ltd. The main drafters of this document. Shen Yueming, Yu Hong, Zhang Kaitian, Wang Huizhen, Li Weidong, Xu Hong, Wang Jianyu, Lin Pengxiang, Chen Weizhe, Hua Mingli, Huang Shuiping, Guo Zhiyong, Han Wenxuan, Chai Jinyan, Wang Zhenghua, Huang Qiongfang, Zhou Zixin, Liu Yuanzhen, Liu Qicui, Zhang Zhihuan, Zheng Decan, Wang Zhewei. Determination of air permeability of wigs for hair products1 ScopeThis document specifies the testing method for the air permeability of hair products. This document is applicable to wigs, wigs and wigs with a cap bottom structure made of all kinds of human hair, chemical fibers and other hair as the main raw materials. Hair block.2 Normative referencesThe contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to This document. GB/T 6529 Standard atmosphere for textile humidity control and testing GB/T 8170 Numerical rounding rules and the expression and determination of limit values3 Terms and definitionsThe following terms and definitions apply to this document. 3.1 Airpermeabilityofhairproducts Under the specified test cross-sectional area, pressure drop and time conditions, the air permeability of hair products.4 PrincipleUnder the specified pressure difference condition, measure the air flow through the measured area of the hair product cap bottom within a certain period of time, and calculate the air permeability.5 Atmosphere for humidity control and testThe air for humidity control and test shall be implemented in accordance with the regulations in GB/T 6529.6 Equipment6.1 Test bench. It is composed of a hemisphere with a radius of (67.5±1.0)mm, and the upper part of the hemisphere has a cut angle of 40°±0.5° (see Appendix A). Figure A.1). In the spherical part of the hemisphere, there are a number of air permeability test holes in concentric positions, uniformly distributed and uniform in size. The total cross-sectional area of the hole should be 38.0 (1±0.3%) cm2 or 20.0 (1±0.3%) cm2.For products with small cap bottom area, test can be used For a test bench with a cross-sectional area of 20.0 (1±0.3%) cm2, see A.1 and A.3.for the structure diagram of the test bench. 6.2 Clamping device. It is composed of a hemisphere with a radius of (65.0±1.0)mm, and the upper part of the hemisphere is a cut angle of 40°±0.5° (see Figure A.2), there should be at least 3 rings of rubber washers (6.3) on the cut surface. In the spherical part of the hemisphere, there are several concentric circles. Air permeability test circular holes with uniform cloth and uniform size. The total cross-sectional area of the circular holes should be at least the same as the total cross-sectional area of the circular holes of the selected test bench (6.1). ...... |
