本文件规定了一种方法，使用甲酸和氯化锌，在去除非纤维物质后，测定粘胶或某些类型的cupro或modal或lyocell在由以下物质制成的纺织品中的质量百分比: -粘胶纤维或某些类型的cupro或modal或lyocell纤维 具有 -亚麻纤维。 本文件不适用于亚麻纤维发生广泛化学降解的混合物，也不适用于粘胶纤维、铜纤维、莫代尔纤维或lyocell纤维因存在某些无法完全去除的永久性饰面或活性染料而变得不完全可溶的混合物。

This document specifies a method, using formic acid and zinc chloride, to determine the mass percentage of viscose or certain types of cupro or modal or lyocell, after removal of non-fibrous matter, in textiles made of mixtures of — viscose or certain types of the cupro or modal or lyocell fibres with — flax fibres. This document is not applicable to mixtures in which the flax fibre has suffered extensive chemical degradation, nor when the viscose, cupro, modal or lyocell fibre is rendered incompletely soluble by the presence of certain permanent finishes or reactive dyes that cannot be removed completely.