White fused aluminium oxide is electrically fused in the furnace with high-grade alumina powder as raw materials. It has higher hardness and slightly lower toughness than brown fused alumimium oxide. Character-rized by its high purity,strong grinding ability,abrasive tools made of it are suitable for grinding and polishing precision-casting,spraying and coasting,medium body for chemical industry, special ceramics and high-grade refractory materials,etc. Chemical composition(%) Grit Size Al2O3 Na2O true density Shaper of grain F12-80 ≥98.50 ≤0.40 F90-150 ≥98.00 ≤0.40 F180-220 ≥98.00 ≤0.40 ≥3.90 Equaled volume F230-400 ≥97.50 ≤0.50 F500-1200 ≥97.00 ≤0.60