... :98%min 2.FEPA,JIS,GB series 3.More than 90% exported Black silicon carbide stone polishing1.High purity,SIC:98% ... FEPA,JIS,GB series3.More than 90% exported1.DescriptionBlack silicon carbide is produced at high temperature in an electric resistance type ... resistance furnace by high temperature. 3.Black crystal, hardnessBlack silicon carbide abrasives are suitable for working on cast iron, non-ferrous ...