It is a kind of white fused alumina electrically fused in arc furnace with high grade processed alumina as raw material. It has higher hardness and slight lower toughness comparing with brown fused alumina. It is also characterized by its high purity, ability of self-sharpening, better cutting, less heat emit, higher efficiency, acid and alkali resistance, good thermal stability.
As an abrasive, it is suitable ofr grinding high-speed, high carbon steel, as loose grains, it widely used for polishing, precision casting, spring and coating.
Typical Chemical Analysis
Al2O3 Fe2O3 Na2O SiO2 CaO TiO2
99.47% 0.05% 0.25% 0.12% 0.01% 0.008%
Color Brilliant white
Shape Angular and sharp
Crystal Form Alpha-alumina
True Specific Gravity 3.95 g/cm3
Hardness 2090 Knoop scale; 9.0 Mohs scale
Refractory Degree About 1800 oC
Magnetic Material 0.0035%