Black silicon carbide is brittle and sharp．It has a good electrical and heat conductivity Knoop hardness is 3100-3280 kg/mm2． Grinding wheels made of C are suitable for the grinding of metal and NONMETAL materials, leather and RUBBER etc.MOREOVER, it can also be used in the manufacture of REFRACTORY products and electric products etc. Features: 1) FEPA standard, F type: grit size F12 - F1500 2) P type: grit size P24 - P2500 3) JIS standard: grit size #12 - #8000