... friable, medium bulk density silicon carbide abrasive grain. Description:GC-GPA is a green, friable, medium bulk density silicon ... to get a complete range of grit sizes.Applications:GC-GPA can be used in refractory, ceramic and abrasive ... JIS):12, 14, 16, 20, 22, 24, 30, 36, 40, 46, 54, 60, 70, 80, 90, 100, 120, 150 ... 2006 or ISO 8486-1. Green Silicon Carbide / GC-GPA for vitrified bonded grinding wheel