This part of ISO 6528 specifies a sodium peroxide fusion method for the determination of the total sulfur content of rubber.
The method is applicable for the determination of all the sulfur present in a rubber or rubber product, including that contained in barium sulfate which may be used as a filler.
It is applicable to NR, CR, SBR, BR, IR, IIR, EPDM, NBR and ebonite (The meanings of these designations are given in ISO 1629:1987, Rubber and latices - Nomenclature).