... grit for producing sanding belt,sanding paper,sand cloth,jumbo roll,fused abrown,corundum,brown aluminium oxide Description:AP-17 It ... Form Alpha alumina trigonal systemSpecific Gravity 3.92Hardness 2090 Knoop scale, 9.0 Mohs scaleMagnetic Material 0.0076%Macrogrit Sizes Available ... -2: 1998 brown fused alumina for making sanding cloth jumbo roll