... series 3.More than 90% exported 4.abrasive High purity,black silicon carbide abrasive1.High purity,SIC:98%min2.FEPA,JIS,GB series 3 ... in some degree. The abrasives made of it are suitable for working on cast iron, non-ferrous metal, rock, leather, rubber ... . 3.Black crystal, hardnessBlack silicon carbide abrasives are suitable for working on cast iron, non-ferrous metal, rock, leather, rubber, ...