White Fused Alumina is made from the high quality alumina by melting above 2000 in the electric arc furnace and cool down. It is white with the main crystal phase alpha-Al2O3.It has the advantage of high bulk density and low porosity and the volume stability and thermal shock resistance. Color White Bulk Density 1.75-1.95 g/cm3 True Density 3. 90 g/cm3 Mohs Hardness 9.0 Al2O3 99.5Min Fe2O3 0.03Max Na2O 0.22Max