Brown fused alumina

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