Glass beads is ideal for grinding , blasting , or as the reflecting mark GLASS BEADSSpecification:Commodity: Glass BeadsSpecific density: 2.32.6g/cm3SiO2: 65%MinHardness: MOH7Indes of refraction: 1.5MinWaterproof: neutralized by 0.01n HCL<10mlRoundess: 80%Min for reflecting mark 90% Min for other applicationApplication:1: Blasting and cleaning2: grinding media for the pigment, ink, etc.Normally ...