... -60um, 60-90um, 70-100um 4.Used for grinding, blasting, polishing. Blasting Glass Beads with Non Alkali1. The chemical composition is ... the grain size can be much smaller, suitable for the polishing treatment of precision equipment. Purpose: 1. Polish aviation parts, relieve ... ±0.2kg. 2. Per clients' requirement. Glass Bead for Blasting Polishing