high purity green silicon carbide making abrasive grinding wheels making precise ... 180, 220.Microgrit Sizes Available:F240, 280, 320, 360, 400, 500, 600, 800, 1000, 1200.JIS240,280,320,360,400 ... ,500,600,700,800,1000,1200,1500,2000,2500,3000,4000 ... Size Distribution :Upon ANSI B74.12-2001, FEPA-Standard 42-1:2006 or ISO 8486-1. High Purity Green Silicon Caribide