... then 98% 2.grit: from F12 to F3000 3,manufacturer Hot selling !!black silicon carbide grinding material1,sic content more then 98 ... for working on cast iron, non-ferrous metal, rock, leather, rubber, etc. It is also broadly used as refractory material and ... for working on cast iron, non-ferrous metal, rock, leather, rubber, etc. It is also broadly used as refractory material and ...