Borosilicate glass is a transparent colorless glass with a 350–2500nm wavelength range and >90% transmittance. It offers strong alkali resistance, with a 400°C max service temperature (550°C with special treatment).
Borosilicate Furnace Viewing Glass Features:
• Materials: Borosilicate & optical glass.
• Processing: Molded, ground, polished.
• Surface: Optical-grade finish with tight tolerance control.
• Clarity: Bubble/impurity-free, transparent interior.
• Performance: High heat resistance & chemical stability.
• Applications: High-temperature observation windows, lighting panels, appliances, labware, solar systems.
Technical Parameter
Glass Name | Heat Resistance High Borosilicate Glass |
Thickness | 0.7–40 mm |
Temperature Resistance | 650°C |
Color | Transparent clear |
Transmittance | 92% |
Density | 2.23 g/cm³ |
Mohs Hardness | 7 |
Composition | Boron: 12.5–13.5%, Silicon: 78–80% |
Shape | Round, square (with holes),Ring, custom shapes |
Modulus of Elasticity | 63×10³ N·mm⁻² |
Poisson's Ratio | 0.18 |
Tensile Strength | 4.8×10⁷ Pa (N/m²) |
Compressive Strength | (0–300) 3.3±0.1×10⁻⁶ K⁻¹ (Note: Likely thermal expansion coefficient) |
Thermal Conductivity | 1.2 W·m⁻¹·K⁻¹ |
Annealing Point | 560°C |
Softening Point | 820±10°C |
Electrical Resistivity | >10¹⁸ Ω·m |
Dielectric Constant | 4.6 (1 MHz, 25°C) |