Composition: | SiO₂ (Silicon Dioxide): ~70-75% |
MgO (Magnesia): ~0-2% | |
Fe₂O₃(Iron Oxide ): <0.01% | |
CaO (Lime):10-13% | |
Na₂O (Sodium Oxide/Soda) : ~12-15% | |
Al₂O₃ (Aluminum Oxide): ~1-2% | |
Thermal Properties | Softening Point: 720°C-750°C (1328°F to 1382°F) |
Annealing Point: 550°C-600°C(1022°F to 1112°F) | |
Strain Point: 500°C-520°C(932°F to 968°F) | |
Maximum Operating Temperature: 400°C-450°C(752°F to 842°F) | |
Thermal Expansion Coefficient (20°C to 300°C): 9.0 × 10⁻⁶/°C | |
Thermal Conductivity:0.93 W.m/m2°C | |
Coefficient of Thermal Stress:0.62 mPa/°C | |
Optical Properties | Refractive Index: 1.50-1.52 |
Light Transmittance: >91% | |
UV Cut-off Wavelength: ~350 nm | |
Solar Energy Transmittance:Up to 90% for solar panel appliction | |
Mechanical Properties | Density: 2.5 g/cm³ |
Young's Modulus: 70-75 GPa | |
Hardness (Moh’s Scale):5 to 6 | |
Tempered Strength:Up to IK07 or higher, depending on thickness and coatings. | |
Poisson's Ratio: 0.20-0.25 | |
Bending Strength: 80-120 MPa |
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