1,Sic 99%max 2,ISO9001 ♦ The black silicon carbide is of high hardness ... from quartz sand ,petroleum coke and anthracite at high temperature.2. Applications:♦ Low tensile strength material. eg. glass, china. ♦ ... glass, leather, rubber, plastic and the thermal sensitive material.3. Partical size,Black silicon carbide F12-320# F320-2000# ... 20 0.30 0.30 2.5 0.60 0.80 1.20 1-3 3-5 5-8 Silicon Carbide grit