Foreword
This document is drafted in accordance with GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents".
This document is part 4 of GB/T 2910 Quantitative Chemical Analysis of Textiles. GB/T 2910 has issued the following parts:
---Part 1: General test rules;
---Part 2: Three-component fiber mixture;
---Part 3: Mixtures of acetate fiber and some other fibers (acetone method);
---Part 4: Mixture of some protein fibers and some other fibers (hypochlorite method);
---Part 5: Mixture of viscose fiber, cuprammonia fiber or modal fiber and cotton (sodium zincate method);
---Part 6: Viscose fiber, some cuprammonia fiber, modal fiber or mixture of Lyocell fiber and cotton (formic acid/zinc chloride method);
---Part 7: Mixture of polyamide fiber and some other fibers (formic acid method);
---Part 8: Acetate fiber and triacetate fiber mixture (acetone method);
---Part 9: Acetate fiber and triacetate fiber mixture (benzyl alcohol method);
---Part 10: Mixture of triacetate fiber or polylactic acid fiber and some other fibers (dichloromethane method);
---Part 11: Mixture of cellulose fiber and polyester fiber (sulfuric acid method);
---Part 12: Polyacrylonitrile fiber, some modified polyacrylonitrile fiber, some chlorine-containing fiber or some mixture of elastic fiber and some other fibers (dimethylformamide method);
---Part 13: Mixture of some chlorine-containing fibers and some other fibers (carbon disulfide/acetone method);
---Part 14: Mixtures of acetate fiber and some chlorine-containing fibers (glacial acetic acid method);
---Part 15: Mixture of jute and certain animal fibers (nitrogen content method);
---Part 16: Mixtures of polypropylene fiber and some other fibers (xylene method);
---Part 17: Mixture of chlorine-containing fiber (vinyl chloride homopolymer) and some other fibers (sulfuric acid method);
---Part 18: Mixture of silk and wool or other animal hair fibers (sulfuric acid method);
---Part 19: Mixture of cellulose fiber and asbestos (heating method);
---Part 20: Mixture of polyurethane elastic fiber and some other fibers (dimethylacetamide method);
---Part 21: Mixture of chlorinated fiber, some modified polyacrylonitrile fiber, some elastic fiber, acetate fiber, triacetate fiber and some other fibers (cyclohexanone method);
---Part 22: Mixture of viscose fiber, some cuprammonia fiber, modal fiber or lyocell fiber with flax and ramie (formic acid/zinc chloride method);
---Part 23: Mixture of polyethylene fiber and polypropylene fiber (cyclohexanone method);
---Part 24: Mixtures of polyester fiber and some other fibers (phenol/tetrachloroethane method);
---Part 25: Mixtures of polyester fiber and some other fibers (trichloroacetic acid/trichloromethane method);
---Part 26: Mixture of melamine fiber and cotton or aramid fiber (hot formic acid method);
---Part 101: Mixture of soybean protein composite fiber and some other fibers.
This document replaces GB/T 2910.4-2009 Quantitative Chemical Analysis of Textiles - Part 4: Mixtures of Some Protein Fibers and Some Other Fibers (Hypochlorite Method). Compared with GB/T 2910.4-2009, except for structural adjustment and editorial changes, the main technical changes are as follows:
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Textiles - Quantitative chemical analysis - Part 4: Mixtures of certain protein fibres with certain other fibres (method using hypochlorite)
1 Scope
This document specifies a method, using hypochlorite, to determine the mass percentage of protein fibre, after removal of non-fibrous matter, in textiles made of bi-component mixtures of certain non-protein fibres and certain protein fibres, as follows:
——wool, other animal-hair (such as cashmere, mohair), silk, regenerated protein fibre, and
——cotton, cupro, viscose, modal, lyocell, acrylic, chlorofibres, polyamide, polyester, polypropylene, glass, polyurethane elastane, elastomultiester, elastolefin, melamine and polypropylene/polyamide bicomponent.
2 Normative references
The following documents contain 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 (including any amendments) applies.
GB/T 2910.1 Textiles - Quantitative chemical analysis - Part 1: General principles of testing (GB/T 2910.1-2009, ISO 1833-1: 2006, IDT)
3 Terms and definitions
No terms and definitions are listed in this document.
4 Principle
The protein fibre is dissolved out from a known dry mass of the mixture with alkaline hypochlorite. The residue is collected, washed, dried and weighed; its mass, corrected if necessary, is expressed as a percentage of the dry mass of the mixture. The percentage of protein fibre is found by the difference.
Foreword i
Introduction iv
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents
6 Apparatus
7 Test procedure
8 Calculation and expression of results
9 Precision
