Standard No.:	GB/T 41418-2022
English Name:	Textiles—Quantitative chemical analysis—Mixtures of meta-aramid and para-aramid fibres（method using dimethylacetamide and lithium chloride）
Chinese Name:	纺织品 定量化学分析 间位芳香族聚酰胺纤维与对位芳香族聚酰胺纤维的混合物（氯化锂/N,N-二甲基乙酰胺法）
Professional Classification:	GB    National Standard
ICS Classification:	59.080.01 59.080.01     Textiles in general 59.080.01
Issued by:	SAMR; SAC
Issued on:	2022-4-15
Implemented on:	2022-11-1
Status:	valid
Language:	English
File Format:	PDF
Word Count:	5500 words
Price(USD):	165.0
Delivery:	via email in 1 business day

Textiles - Quantitative chemical analysis - Mixtures of meta-aramid and para-aramid fibres (method using dimethylacetamide and lithium chloride) 1 Scope This document specifies a method using dimethylacetamide and lithium chloride to determine the fibre percentage of binary mixtures of meta-aramid and para-aramid fibres, after removal of non-fibrous matter. This document is applicable to the binary mixtures of meta-aramid and para-aramid fibres. Note: See Annex A for the method for identifying fibres in the mixtures of meta-aramid and para-aramid fibres. 2 Normative references The following document contains requirements 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 2910.1 Textiles - Quantitative chemical analysis - Part 1: General principles of testing 3 Terms and definitions No terms and definitions apply for the purposes of this document. 4 Principle The meta-aramid fibre is dissolved out from a known dry mass of the mixture with dimethylacetamide and lithium chloride solution. The residue is collected, washed, dried and weighed; its mass, corrected if necessary, is used for calculating the percentage of the dry mass of the mixture. The percentage of meta-aramid fibre is obtained by difference.  

Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Principle 5 Reagent 6 Apparatus 7 Test procedure 8 Calculation and expression of results 9 Precision 10 Test report Annex A (Informative) Method for identifying meta-aramid and para-aramid fibres Bibliography