Reflective powder is a kind of glass beads powder material into production, divided into three kinds of refractive index, namely:ND ≥ 1.90, ND ≥ 1.93, ND ≥ 2.2 specifications from 100 -- 500 orders can be grading, color is silver and white choice.Chemical composition of 1 reflective powder: SiO2, CaO, Na2O,Tio2, Bao and other 2 weight: 4.2 grams / cubic centimeter 3appearance: White: smooth, round glass transparent, free of impurities. Gray: gray, smooth and free of impurities. Reflective material products with high refractive index glass bead thefluorescent pigment coated aluminum as retroreflector, withretro reflective properties strong, can be directly reflected backlight 85% light, reflective brightness caused by reflection, can make the driver and with light night workers at night or of poor vision not clearly see the pedestrian and the obstacle, ensure the safety of both sides.