The grades of silicon carbide abrasives are specified as follows:
—-The grade of black silicon carbide for vitrified bonded abrasives, coated abrasives and free grinding, polishing and cutting is C
—-The grade of green silicon carbide for vitrified bonded abrasives, coated abrasives and free grinding, polishing and cutting is GC;
—-The grade of black silicon carbide for bonded abrasives with organic bond is C-B;
—The grade of green silicon carbide for bonded abrasives with organic bond is GC-B.
