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
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