... green, friable, medium bulk density silicon carbide abrasive grain. Description:GC-GPA is a green, friable, medium bulk density silicon carbide abrasive ... carefully to get a complete range of grit sizes.Applications:GC-GPA can be used in refractory, ceramic and abrasive area, such ... 42-1:2006 or ISO 8486-1. Green Silicon Carbide / GC-GPA for vitrified bonded grinding wheel