... impurity. Widely used in sandblasting,polishing,grinding. H&X glass beads with the quality of clean,transparent,no bubbles and impurity. Widely ... -270 106-53 280# 200-325 75-45 Grinding Glass beads 1-1.5mmChemical AnalysisPhysical PropertiesSiO2≥65.0%Bulk Density1 ... 0.1%UsageGrinding MaterialBS6088 British StandardAASSHTO M247 American Standard High Quality Glass Beads for Grinding, blasting, polishing