This International Standard specifies three methods for the determination of the total sulfur in all types of
carbon black for use in the rubber industry:
Method A, using an oxygen bomb calorimeter;
Method B, using a combustion furnace;
Method C, using an automatic analyser.
With respect to safety aspects and test precision, it is preferable to use automatic systems. Classical chemical
analysis (Method A and Method B) is acceptable if automatic equipment is not available.
ISO 1138:2007 history
2022ISO 1138:2022 Rubber compounding ingredients — Carbon black — Determination of sulfur content
2012ISO 1138:2007/Amd 1:2012 Rubber compounding ingredients - Carbon black - Determination of sulfur content - Amendment 1: Clarification of digestion temperature in Subclause 3.4.5
2007ISO 1138:2007 Rubber compounding ingredients - Carbon black - Determination of sulfur content