ITEM          white corundum    Brown Corundum 
Al2O3(%min)           99.2            95 
Fe2O3(%max)           0.5             0.5 
TiO2(%max)            -                3 
Na2O+K2O(%max)        0.4              - 
B.D?g/cm3?          3.7             3.8 
A.P                    8               8 
True specific weight  3.95            3.97