China Road Marking Glass Beads Suppliers - High-Quality Reflective Beads from Our Factory for Safe Traffic Markings
The following chemical composition values are typical reference ranges for soda-lime road marking glass beads. Actual values may vary slightly according to raw materials, production batch, customer standard, and customized grade. WANCHENG MINERAL can provide batch inspection documents according to customer requirements.
| Chemical Component | Typical Range | Function |
|---|---|---|
| SiO2 | 65-75% | Main glass network former |
| Na2O | 10-18% | Improves melting and glass formation |
| CaO | 5-12% | Improves hardness and stability |
| MgO | 0-5% | Improves durability |
| Al2O3 | 0-5% | Improves chemical stability |
| K2O | 0-3% | Auxiliary flux component |
| Fe2O3 | <=0.5% | Controlled for appearance and transparency |
Silicon Dioxide (SiO2) accounts for 65–75% of the composition and serves as the primary glass network former, providing core mechanical strength, structural integrity, and high chemical resistance against environmental degradation.
Fe2O3 directly influences optical clarity. Keeping iron oxide content minimal ensures clear glass spheres with maximum light transmittance and superior retroreflectivity under night driving conditions.
Na2O (Sodium Oxide) functions as a flux to optimize melting and roundness during formation, while CaO (Calcium Oxide) enhances hardness, water resistance, and long-term durability under heavy traffic wear.
Yes. While the standard reference ranges suit most applications, customized formulations can be prepared to comply with specific standard criteria such as AASHTO M247, EN 1423 / EN 1424, or tailored customer specifications.
Yes, WANCHENG MINERAL provides Certificate of Analysis (COA) and batch test records covering chemical composition, gradation, sphericity, and refractive index upon request for every production lot.
Balanced concentrations of Al2O3, MgO, and CaO prevent acid and alkali attack from ambient road moisture, salts, and atmospheric contaminants, ensuring the beads do not haze or pit over extended service periods.
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