Glass bead is a new type of material with wide application and special properties developed in recent years. The product is made of borosilicate raw materials through high-tech processing. It is a small glass bead with uniform particle size. The product has the advantages of light weight, low thermal conductivity, high strength, good chemical stability, reflection and so on. Chemical composition: SiO2 > 67%, Cao > 8.0%, MgO > 2.5%, Na2O < 14%, Al2O3 0.5-2.0, Fe2O3 > 0.15, others 2.0%; Specific gravity: 2.4-2.6 g / cm3; Appearance: smooth, round, transparent glass without impurities; Rounding rate: ≥ 85%; Magnetic particles shall not exceed 0.1% of the product weight; The content of bubbles in glass beads is less than 10%; It does not contain any silicone components.
| Regular size(Mesh) | Particle size range（um） |
| 10-20 | 1900-850 |
| 20-30 | 800-600 |
| 30-50 | 600-300 |
| 50-150 | 300-100 |
| 150-200 | 100-75 |