FEPA P grit for producing sanding belt,sanding paper,sand cloth,jumbo roll,fused abrown,corundum, ... AP-17 can be used for producing all kinds of coated abrasives products, such as sand paper, cloth, rolls, belts, ... 3.92Hardness 2090 Knoop scale, 9.0 Mohs scaleMagnetic Material 0.0076%Macrogrit Sizes Available (P):12, 16, 20 ... or ISO 6344-2: 1998 brown fused alumina for making sanding cloth jumbo roll