... most competitive prices 2.high-grade refactory materials white aluminium oxide is a high-quality aluminium oxide powder ... color white ,high hardness, low toughness, high purity, excellent self-sharpening, grinding power, heat, high efficiency,acid corrosion, high temperature, thermal ... 99≤0.1≤0.35≤0.3—colorwhite hardness( mohs )9.0Melting point(°c)2250Maximum service temperature(°c)1900Ture density (g ...