HR Series High Retro-reflective Glass Beads Features: Light blue transparent glass beads. Very high roundness via unique technology. Wide distribution range of sizes from 100 μm to 5000 μm. Stable refractive index and superior retro-reflectivity. Reasonable chemical composition and low content of heavy metals. Application Range: Variety of drop-on for reflective road marking. Variety of intermix for reflective paint. Drop-on for reflective anti-slip/anti-skid road marking. Package: Paper bag, 25 kg (55 lbs)/bag. 1 metric ton super bag (1000 kg/bag) Size: I series - φ 0.3 to 0.85 mm (0.012 to 0.03 inch) II series - φ 0.85 to 1.4 mm (0.03 to 0.056 inch) Specification: Density | 2.5±0.1 g/m3 | Mohs Hardness | 6.0-6.7 Mohs | Elasticity Modulus | 7×104 Mpa | Compressive Strength | 700-850 Mpa | Softening point | 650~720°C | Coefficient of Thermal Expansion | （90~100×10-7/°C(20-350°C) | Specific Enthalpy/Thermal capacity | 790~840 J/(kg.K) | Refractive Index | 1.51~1.52 | Roundness | ＞90% | Size Range | 100~5000 microns Wide variety sizes of glass beads from 200 to 3000 microns are available depending on the request. | Chemical Composition | SiO2：70~73%; Al2O3：0.3~1.4%; CaO：7~10%; MgO: 3~4.5%; Na2O:11~15%; K2O: 0. 3~1.0%; Fe2O3: 0.02~0.1%; SO3: 0. 1~0.4%. |
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