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 ... cast iron, bronze, brass, ore, bone, glass, leather, rubber, plastic and the thermal sensitive material.3. Partical size,Black silicon carbide ...