... , transparent, no bubbles and impurity, widely used in blasting, polishing, grinding etc. Glass beads with the quality of clean, transparent, no bubbles ... chemically with other materials so that it widely used in blasting, polishing, grinding etc. Chemical AnalysisPhysical PropertiesSiO2≥65.0%Bulk Density1 ... .5. Used in reflective material for road marking lines. Glass beads for grinding and blasting