GB/T 39621-2020 English PDFUS$209.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 39621-2020: Textiles - Quantitative chemical analysis - Mixture of cross-linked lyocell fibres and viscose or cupro or modal (method using formic acid and zinc chloride) Status: Valid
Basic dataStandard ID: GB/T 39621-2020 (GB/T39621-2020)Description (Translated English): Textiles - Quantitative chemical analysis - Mixture of cross-linked lyocell fibres and viscose or cupro or modal (method using formic acid and zinc chloride) Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: W04 Classification of International Standard: 59.080.01 Word Count Estimation: 11,126 Date of Issue: 2020-12-14 Date of Implementation: 2021-07-01 Quoted Standard: GB/T 2910.1 Regulation (derived from): National Standard Announcement No. 28 of 2020 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration Summary: This standard specifies the method for determining the fiber content in a two-component mixture of cross-linked lyocell fiber and viscose fiber, cupra fiber or modal fiber after removing non-fiber substances by the formic acid/zinc chloride method. This standard applies to the two-component mixture of cross-linked lyocell fiber and viscose fiber, cupra fiber or modal fiber. This standard does not apply to mixtures that contain cross-linked lyocell fibers that have been severely chemically degraded, nor do they apply to mixtures that contain viscose fibers, cupra fibers or modal fibers that cannot be completely dissolved. GB/T 39621-2020: Textiles - Quantitative chemical analysis - Mixture of cross-linked lyocell fibres and viscose or cupro or modal (method using formic acid and zinc chloride)---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. (Textiles Quantitative chemical analysis The mixture of cross-linked lyocell fiber, viscose fiber, cupra fiber, and modal fiber (formic acid/zinc chloride method)) ICS 59:080:01 W04 National Standards of People's Republic of China Textile quantitative chemical analysis cross-linked lyocell Fiber and viscose fiber, cupra fiber, modal fiber Mixture (formic acid/zinc chloride method) 2020-12-14 release 2021-07-01 implementation State Administration for Market Regulation Issued by the National Standardization Management Committee ForewordThis standard was drafted in accordance with the rules given in GB/T 1:1-2009: This standard was proposed by the China National Textile and Apparel Council: This standard is under the jurisdiction of the National Textile Standardization Technical Committee (SAC/TC209): Drafting organizations of this standard: Shijiazhuang Customs Technology Center, China Textile Standard Inspection and Certification Co:, Ltd:, China Textile Research Institute Co:, Ltd: Company, Zhejiang Anji Huayi Chemical Fiber Co:, Ltd:, Antai (Deqing) Fashion Co:, Ltd:, Zhejiang Shengfa Textile Printing and Dyeing Co:, Ltd:, China Textile Standard (Shenzhen) Shenzhen) Inspection Co:, Ltd:, Jinjiang China Textile Standard Inspection Co:, Ltd:, Shenzhen Institute of Metrology and Quality Inspection: The main drafters of this standard: Liu Jinrui, Ma Yongmei, Zhang Xiangli, Gao Youjun, Han Yuru, Fan Xiaoqin, Cheng Chunzu, Zhang Dong, Xie Zebo, Xu Xuefeng, Yang Hao, Qian Anhua, Wu Dongping: Textile quantitative chemical analysis cross-linked lyocell Fiber and viscose fiber, cupra fiber, modal fiber Mixture (formic acid/zinc chloride method) Warning: The personnel using this standard should have practical experience in formal laboratory work: This standard does not point out all possible safety issues, Users are responsible for taking appropriate safety and health measures, and to ensure compliance with relevant national regulations:1 ScopeThis standard specifies the use of formic acid/zinc chloride method to determine cross-linked lyocell fiber, viscose fiber, cupro ammonia fiber after removing non-fibrous substances The method of fiber content in the two-component mixture of Vi or Modal fiber: This standard applies to the two-component mixture of cross-linked lyocell fiber and viscose fiber, cupra fiber or modal fiber: This standard does not apply to mixtures containing cross-linked lyocell fibers that have been severely chemically degraded, nor does it apply to mixtures containing certain Mixture of viscose fiber, cupra fiber or modal fiber that cannot be completely dissolved:2 Normative referencesThe following documents are indispensable for the application of this document: For dated reference documents, only the dated version applies to this article Pieces: For undated references, the latest version (including all amendments) applies to this document: GB/T 2910:1 Textile Quantitative Chemical Analysis Part 1: General Test Rules3 PrincipleAccording to the difference in solubility of cross-linked lyocell fiber, viscose fiber, cupra fiber and modal fiber in formic acid/zinc chloride solution (See Appendix A), use formic acid/zinc chloride solution to dissolve viscose fiber, cupra fiber or modal fiber from a mixture of known dry mass The solution is removed, the residue is collected, washed, dried and weighed, and the percentage of the dry mass of the mixture is calculated with the corrected mass: By difference Calculate the mass percentage of the second fiber:4 Reagents and materials4:1 Unless otherwise stated, only use analytical reagents: Use the reagents and materials specified in GB/T 2910:1 and 4:2~4:5 of this standard: 4:2 Formic acid/zinc chloride solution: 20g anhydrous zinc chloride (mass fraction >98%) and 68g anhydrous formic acid add water to 100g: Note: This reagent is harmful to humans, and proper protective measures should be taken when using it: 4:3 Sodium sulfide solution: add 5:0g of sodium sulfide into 100mL of 70 ℃ water, shake well: The solution should be prepared immediately: Note: SOS powder is a dangerous chemical, easy to spontaneously ignite, and irritating: Please read the safety instructions and other related materials carefully before use: Good protective measures: 4:4 Acetic acid solution: Take 40mL of glacial acetic acid and dilute to 1L with water: 4:5 Sodium dodecyl sulfonate solution: Dissolve 1:0 g of sodium dodecyl sulfonate in 1L of water:5 Apparatus and equipment5:1 Use equipment specified in GB/T 2910:1 and 5:2~5:4 of this standard: ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 39621-2020_English be delivered?Answer: Upon your order, we will start to translate GB/T 39621-2020_English as soon as possible, and keep you informed of the progress. 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