... TiO2 ring contains a small amount of SiO2 and Fe2O3, microhardness HV1800-2200, toughness ... , sand. 1. The sand brown corundum - sandblasting abrasive hardness modest, stacking density high, no free silica, ... , heat resisting oxidation coating. (2) with hardness, good abrasion resistance, high strength characteristics ... and great toughness is abrasives industry, 95 content level of brown fused alumina , ...