Is a high-quality aluminum oxide powder as raw material, fused refining crystal, high purity, self-sharpening, acid corrosion, high temperature, thermal properties and stability is slightly higher than the hardness of corundum, lower toughness, high purity Since sharpening, grinding ability, heat a small, high efficiency, acid corrosion, high temperature thermal stability. Made with the abrasive, for grinding carbon copper, high-speed steel.