1,Sic 99%max 2,ISO9001 ♦ The black silicon carbide is of high hardness, brittleness.♦ Chemical washed and water ... as good thermal conductivity and quick heat dissipation.♦ Black silicon carbide is produced in an electric resistance furnace from quartz sand ... bone, glass, leather, rubber, plastic and the thermal sensitive material.3. Partical size,Black silicon carbide F12-320# F320-2000# JIS240-10000# ...