Green silicon carbide has a high purity,and is brittle.Knoop hardness is 3288-3400 kg/mm2 Grinding wheels made of it are suitable for processing hard and brittle non-meltalic workpiece,such as cemented carbide,optical glass, agate, ceramics as well as hard alloy etc.It can also be used in the manufacture of high-class refractory products,electrothermal products, electrical appliance 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