... -quality aluminum oxide powder as raw material, formed by the crystallization of fused refining, high purity, self-sharpening, ... high temperature thermal stability performance, it is slightly higher than the brown corundum hardness, toughness is slightly lower, high purity , ... Pure whiteCrystalTrigonal systemHardness≥9.0 melting point (C) 2250 The maximum temperature(C) 1900 True Density(g/cm3) ≥3 ...