Brown Fused Alumina with Middle Temperature Treatment This kind of Brown Fused Alumina grains is calcined at the high temperature, and with the anneal treatment.It is characterized by very low coefficient of linear expansion,very good hydrophilicity, good toughness and high hardness, producing the sintered grinding tools that is characterized by deep blue color after firing, without resillage, without rust and so on. So our this kind of product increase the precision and grinding ability of the grinding tools in the using course. Brown Fused Alumina with middle temperature treatment is applicable to make high quality bonded abrasives. Chemical Composition Purpose Specification Chemical composition Magnetic material content Al2O3 Fe2O3 SiO2 TiO2 For abrasive F 48 0 95.0 Min 0.3 Max 1.5 Max 3.0 Max 0.05 Max 90 150 94.0 Min 0.03 Max 180 240 93.0 Min 0.3 Max 1.5 Max 3.0 Max 0.02 Max Physical Properties Color Cambridge Blue Crystal Form Alpha alumina trigonal system Hardness 9.0 Mohs scale Melting Temperature About 2050 Maximum Use Temperature 1800 True Density g cm3 3.90 Magnetic Material 0.0082