DIN EN ISO 1833-21-2011 紡織品.定量化學分析.第21部分:含氯纖維,某些改性聚丙烯腈纖維,某些彈性纖維,醋酯纖維,三醋酯纖維與某些其他纖維的混合物(環已酮法)(ISO 1833-21-2006);德文版本EN ISO 1833-21-2010
Textiles - Quantitative chemical analysis - Part 21: Mixtures of chlorofibres, certain modacrylics, certain elastanes, acetates, triacetates and certain other fibres (method using cyclohexanone) (ISO 1833-21:2006); German version EN ISO 1833-21:2010