The main material of Brown Fused Alumina is bauxite, which is electrically fused in high temperature. It is brown and features high hardness and toughness. The abrasives tools made of it are suitable for grinding of carbon steel, malleable cast iron and hard bronze. This material is also used as refractory materials, chemical additives, precision founding and anti-sliding materials. Chemical compositions: F4-F80 (P12-P80): Al2O3: 95.00%-97.50%; TiO2: 1.5%-1.8%; CaO: less than 0.45% F90-F150 (P100-P150): Al2O3: 94.00%-97.50%; TiO2: 1.5%-1.8%; CaO: less than 0.45% F180-F220 (P180-P220): Al2O3: 93.00%-97.50%; TiO2: 1.5%-1.8%; CaO: less than 0.45% F220 (P220) finer: Al2O3: more than 92.00% Physical properties: Basic mineral: a-Al2O3 Crystal size: 400-800um True density: more than 3.90g/cm3 Bulk density: 1.40-1.85g/cm3 Hardness: 1,800-2,200g/mm2 Water-washed P grains of brown fused alumina: AP50: 95% cleanness AP80: 95% cleanness The bulk density of shaped brown fused alumina: F24: 1.8-1.95g/cm3 F30: 1.77-1.90g/cm3 F36: 1.75-1.95g/cm3 F40: 1.73-1.86g/cm3 F46: 1.70-1.84g/cm3 F54: 1.68-1.82g/cm3 F60: 1.66-1.80g/cm3 F70: 1.63-1.76g/cm3 F80: 1.61-1.71g/cm3 F90: 1.59-1.71g/cm3 F100: 1.57-1.68g/cm3 F120: 1.54-1.68g/cm3 F150: 1.50-1.65g/cm3 F180: 1.48-1.62g/cm3 F220: 1.45-1.55g/cm3