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See Chinese contents: GB/T 2910.4-2022 GB/T 2910.4-2022: Textiles -- Quantitative chemical analysis -- Part 4: Mixtures of certain protein fibres with certain other fibres(method using hypochlorite)
This document specifies a method for the determination of the protein fiber content of certain protein fibers and certain non-protein fiber bi-component mixtures, which consists of the following fibers, after removal of non-fibrous matter by the hypochlorite method: - Sheep wool, other animal hair fibers (e.g. cashmere, mohair), silk, regenerated protein fibers, and - Cotton, cupro fibers, viscose fibers, modal fibers, lyocell fibers, acrylonitrile fibers, chlorine fibers, polyamide fibers, polyester fibers, polypropylene fibers, glass fibers, polyurethane elastane fibers, polyester laminate elastane fibers, polyolefin elastane fibers, melamine and polypropylene/polyamide composite fibers.
