本文件规定了用浓硫酸在去除非纤维材料后，测定由以下混合物制成的纺织品中氯纤维和某些其他纤维的质量百分比的方法-棉、粘胶、铜、莫代尔纤维、莱赛尔纤维、醋酸纤维、三醋酸纤维、聚酰胺纤维、聚酯纤维、弹性多酯纤维、某些腈纶纤维和某些莫代尔腈纶纤维具有-氯纤维（基于氯乙烯均聚物）、聚丙烯、弹性烯烃、三聚氰胺和聚丙烯/聚酰胺双组分。有关的改性丙烯酸树脂是那些在浓硫酸中浸泡时能提供澄清溶液的树脂。在初步试验表明氯纤维不完全溶解于二甲基甲酰胺或二硫化碳和丙酮的共沸混合物的所有情况下，可以使用该方法，特别是代替ISO 1833-12和ISO 1833-13中所述的方法。

This document specifies a method, using concentrated sulfuric acid, to determine the mass percentage of chlorofibres and certain other fibres, after removal of non-fibrous material, in textiles made of mixtures of — cotton, viscose, cupro, modal, lyocell, acetate, triacetate, polyamide, polyester, elastomultiester, certain acrylic and certain modacrylic fibres with — chlorofibres (based on homopolymers of vinyl chloride), polypropylene, elastolefin, melamine and polypropylene/polyamide bicomponent. The modacrylics concerned are those which give a clear solution when immersed in concentrated sulfuric acid. This method can be used, particularly in place of the methods described in ISO 1833-12 and ISO 1833-13, in all cases where a preliminary test shows that the chlorofibres do not dissolve completely either in dimethylformamide or in the azeotropic mixture of carbon disulfide and acetone.