1.1 This part of ISO 9924 specifies a thermogravimetric method for the determination of the total
organic content, carbon black content and ash in vulcanizates and uncured compounds. The loss in mass
at 300 °C is an approximate guide to the volatile-matter content of the compound.
1.2 The method is suitable for the analysis of rubber compounds and vulcanizates containing the
following rubbers occurring alone or as mixtures:
a) polyisoprene of natural or synthetic origin
b) polybutadiene
c) styrene-butadiene copolymers
d) isobutylene-isoprene copolymers
e) ethylene-propylene copolymers and related terpolymers.
NOTE The field of application of the method may be extended to the analysis of compounds containing
rubbers different from those given in this subclause, provided that the applicability of the method is tested
beforehand using known compounds or vulcanizates having a similar composition. Other compounds are covered
in ISO 9924-2.
1.3 The method is not suitable for rubbers containing polymers which form a carbonaceous residue
during pyrolysis, such as many chlorine- or nitrogen-containing rubbers.
1.4 The method is also not suitable for materials containing additives which cause the formation of
carbonaceous residues during pyrolysis, such as cobalt and lead salts or phenolic resins.
1.5 The method is not suitable for compounds containing mineral fillers, such as carbonates or
hydrated aluminium oxides, which decompose in the temperature range from 25 °C to 650 °C, unless
suitable corrections based on prior knowledge of filler behaviour can be made.
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ISO 9924-1:2016(E)
1.6 The method is not suitable for the determination of the total polymer content of compounds or
vulcanizates containing non-rubber organic ingredients that cannot be completely removed by solvent
extraction carried out in accordance with ISO 1407.