Brown fused alumina， with high quality bauxite as main material， features micro-hardness and is tougher than silicon carbide. It is suitable for the normal grinding， cutting-off and loose grain polishing of metal materials with high tensile strength， such as carbon steel， alloy steel， malleable cast iron and hard bronze. It is also a very practical advanced refractory material.Application: 1. Cotaed and bonded abrasive tools2. Lapping and polishing processes3. Sandblasting 4. Producing mold of precision casting 5. Refractory materials6. Physical Characteristics: