ISO 1833-12:2020

This document specifies a method, using dimethylformamide, to determine the mass percentage of acrylic, modacrylic, chlorofibre or elastane, after removal of non-fibrous matter, in textiles made of mixtures of
- acrylic, certain modacrylics, certain chlorofibres, certain elastane fibres
with
-  wool, animal hair, silk, cotton, viscose, cupro, modal, lyocell, polyamide, polyester, polypropylene, elastomultiester, elastolefin, melamine, polypropylene/polyamide bicomponent, polyacrylate or glass fibres.
It is not applicable to animal hair, wool and silk dyed with chromium based mordant dyes.
NOTE    Dyestuff identification is described in ISO 16373-1.