... 1,sic content more then 98% 2.grit: from F12 to F3000 3,manufacturer Hot selling !!black silicon carbide grinding material1,sic ... electrical and heat conductivity in some degree. The abrasives made of it are suitable for working on cast iron, non-ferrous ... temperature. 3.Black crystal, hardnessBlack silicon carbide abrasives are suitable for working on cast iron, non-ferrous metal, rock, leather, ...