... of clean,transparent,no bubbles and impurity. Widely used in sandblasting,polishing,grinding. H&X glass beads with the quality of ... blasting,polishing,grinding etc. ModelMeshSize μm 30# 20-40 850-425 40# 30-40 600-425 60# 40-60 425-300 80# 60-100 300 ... %UsageGrinding MaterialBS6088 British StandardAASSHTO M247 American Standard Abrasive glass beads for sandblasting and polishing