Brown Fused Alumina is fused and crystallized under high temperature from Mixture of bauxite and other materials , characterized by its high hardness, good toughness and sharp shape in particles. Abrasive tools made of it are suitable for grinding metals of high-tensile strength such as carbon stele, general purpose alloy steel, malleable cast-iron and hard bronze etc. Grit Size Al2O3 TiO2 SiO2 Fe2O3 CaO MgO F4-F80 95.59-97.5 2.0-3.8 ≤0.9 ≤0.15 ≤0.35 ≤0.5 F90-F150 94.5-97.5 F180-F220 93.5-96.5