... ,Sic 99%max 2,ISO9001 ♦ The black silicon carbide is of high hardness, brittleness.♦ Chemical washed and water washed good cleanness ... as well as cutting and making jewelry, jade, agate. ♦ Grinding of gray cast iron, white cast iron, bronze, brass, ore, bone ... # Sic>98% washed by acid, F12-320# Sic>90% standard of P:P80-2500#. SymbolScriesGrit SizeChemical Properties % Grit SizeSicF.CFe2O3C F 12 ...