... -GPA can be used in refractory, ceramic and abrasive area, such as making vitrified bonded grinding wheels, resin bonded tools, to process ... polishing none-metal material like ceramic, glass, stone, agates, jades and jewels.Typical Chemical Analysis:SiC 99.43%Free Carbon 0 ... 8486-1. Green Silicon Carbide / GC-GPA for vitrified bonded grinding wheel