... 3.More than 90% exported Black silicon carbide stone polishing1.High purity,SIC:98%min 2.FEPA,JIS ... suitable for working on cast iron, non-ferrous metal, rock, leather, rubber, etc. It is also broadly used ... is the main raw materials of quartz sand , stone sand and petroleum coke. 2.It is made in ... suitable for working on cast iron, non-ferrous metal, rock, leather, rubber, etc. It is also broadly used ...