This part of ISO 14720 defines a method for the determination of sulfur in non-oxidic ceramic raw materials and ceramic materials, such as silicon carbides, silicon nitrides, graphites, carbon blacks, cokes, carbón powders. If proved by the recovery rate, this method can also be applied for other non-metallic powdered and granular materials, for example silicon dioxide. This part of ISO 14720 is applicable for materials with mass fractions of sulfur from 0,005 % to 2 %. This part of ISO 14720 can also be applied for materials with higher mass fractions of sulfur after verification of the particular case.