This part of ISO 9924 specifies a thermogravimetric method for determining 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 part 1 of this International Standard plus the following copolymers with polar groups which form a carbonaceous residue on pyrolysis:

• acrylonitrile-butadiene copolymers (NBRs);
• carboxylated acrylonitrile-butadiene copolymers (XNBRs);
• hydrogenated acrylonitrile-butadiene copolymers (HNBRs);
• chlorinated isobutylene-isoprene copolymers (CIIRs);
• brominated isobutylene-isoprene copolymers (BIIRs).