Glass Bead with Refractive Index 1.93Nd 1.93nd glass bead is used for Exposed-Lens type retro-reflective articles, such as open-type reflective sheets, reflective fabric. reflective tape, reflective yarn and Encapsulated-Lens type retro-reflective articles, such as high intensity grade reflective sheet. I. Technical Data Composition TiO2-BaO-SiO2 GLASS Refractive Index 1.93±0.01Nd Specific Gravity 4.1±0.2 g/cm3 Color White Form Fine spheres powder Size 10-100um(can be provided by specific request) Roundness 95% Opacity 1% Aluminum Coated Glass Bead with Refractive Index 1.93ND Aluminum coated glass bead is used for road signs , traffic safety goods and reflective printing ink, screen printing etc. I. Technical Data Composition TiO2-BaO-SiO2  GLASS Refractive Index 1.93±0.01Nd Specific Gravity 4.1±0.2 g/cm3 Color Silver grey Form Fine spheres Semi-coated with aluminum Size 25-38um;30-45um; 40-55um; 50-75um