... P grit,brown aluminum oxide grain for producing high quality sanding belt,sanding paper,sand cloth,jumbo roll Description:AP-17 ... dust collected by well water washing, AP-17 can be used for producing all kinds of ... 9.0 Mohs scaleMagnetic Material 0.0076%Macrogrit Sizes Available (P):12, 16, 20, 24, 30, 36, 40 ... 80, 100, 120, 150, 180, 220.Microgrit Sizes Available (P):240, 280, 320, 360, 400, 500, 600, 800 ...