Composition: | SiO₂ (Silicon Dioxide): ~80% |
B₂O₃ (Boron Trioxide): ~12-13% | |
Na₂O (Sodium Oxide) + K₂O (Potassium Oxide): ~4-5% | |
Al₂O₃ (Aluminum Oxide): ~2-3% | |
Thermal Properties | Softening Point: 820°C |
Annealing Point: 560°C | |
Strain Point: 520°C | |
Maximum Operating Temperature: 500°C | |
Thermal Expansion Coefficient (20°C to 300°C): 3.3 × 10⁻⁶ /°C | |
Optical Properties | Refractive Index: 1.474 |
Light Transmittance: >92% | |
UV Cut-off Wavelength: ~290 nm | |
Mechanical Properties | Density: 2.23 g/cm³ |
Young's Modulus: 64 GPa | |
Poisson's Ratio: 0.20 | |
Bending Strength: 40 MPa | |
Chemical Resistance: | Acid Resistance: Excellent Alkali Resistance: Good Hydrolytic Resistance: Class 1 (per ISO 719) |
Alkali Resistance: Good | |
Hydrolytic Resistance: Class 1 (per ISO 719) |
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