ISO 9924-2:2016 specifies a thermogravimetric method for the determination of the total organic content, carbon black content, carbonaceous residue and ash in vulcanizates and uncured compounds containing polymers which form a carbonaceous residue on pyrolysis (see 1.2). The loss in mass at around 300 °C is an approximate guide to the volatile-matter content of the compound.The method is suitable for the analysis of rubber compounds and vulcanizates containing the hydrocarbon polymers covered by ISO 9924-1 plus the following copolymers with polar groups which form a carbonaceous residue on pyrolysis:a) acrylonitrile-butadiene copolymers (NBRs);b) carboxylated acrylonitrile-butadiene copolymers (XNBRs);c) hydrogenated acrylonitrile-butadiene copolymers (HNBRs);d) chlorinated isobutylene-isoprene copolymers (CIIRs);e) brominated isobutylene-isoprene copolymers (BIIRs).