... foam ceramics, modification of coating and plastics, auto parts, war industry and aviation, steelmaking, etc.Black silicon carbide is classified ... the follow table Granularity rangeSiC ≥Free carbon ≤Fe2O3% ≤Black silicon carbideCrude lump98.50.30.8Sand98.00.30.8150 ... powder for deoxidization of steelmaking in specification of 50, 60, 70, 80 and 90 can be customized. price of black silicon carbide