... for grinding,blasting,polishing and reflecting mark Specifications 1 Character: Colourless and transparent ball, no visible bubbles and impurity. 2 Specification: ... good chemical stability, certain mechanical intensity and hardness, so as polishing and grinding.Donot pollute the processing metal., ... refraction: 1.5Min Roundess: 80%Min for reflecting mark,90% Min for other application Grit Size:10,12 ...