Glass Microspheres High Refractive Index Bulk Road Traffic Marking Beads

Our road marking glass beads are manufactured from high-quality soda-lime glass. The glass is melted in a high-temperature furnace and atomized into perfectly spherical microspheres, then annealed, screened and cleaned. Each bead features a smooth, clear surface with no sharp edges and no internal bubbles.

The working principle is retroreflection: light from vehicle headlights enters the glass bead, is refracted and reflected inside the sphere, and returns to the driver's eyes, making road lines visible at night and in rainy conditions. Refractive index is approx. 1.5, and high roundness ensures stable optical performance, so the line keeps uniform and continuous brightness.

Available in multiple particle size grades commonly used in the market. Coarser grades are mainly applied as drop-on beads sprayed onto the surface of thermoplastic markings to build instant retroreflection; finer grades are premixed into thermoplastic, solvent-based and waterborne marking paints to provide long-term reflection as the marking wears.

The beads have high compressive strength and excellent weather resistance, resistant to abrasion, freeze-thaw and road salt corrosion. They are widely used for highway, municipal road, airport runway, parking lot and crosswalk markings.

Small retail bags suit contractors for local projects. Bulk ton-bag supply serves marking paint manufacturers, road construction companies and government infrastructure projects. Large-volume orders support custom particle size grading, custom packing and private-label service.