Brown Fused Alumina AL-95 Al-97 Al-98 Al2O3 95% min 97% min 98% min Fe2O3 0.25% max 0.2% max 0.2% max TiO2 3.0% max 2.0% max 1.0% max SiO2 1.0% max 0.8% max 0.5% max CaO+MgO 0.5% max 0.5% max 0.5% max Hardness(Mohs) 9.0 9.0 - True density 3.9 g/cc min 3.9 g/cc min 3.75 g/cc min Size: From origingal Lumps To-325Mesh