Changzhou Longxing Glass Products Factory
Changzhou Longxing Glass Products Factory
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High quality, quartz glass tube used to patio gas heater
More than 1000°C temp. difference, quartz glass tube used to patio gas heater
1. Materials is borosilicate glass, Belongs to hard glass
2. Transmittance: Thickness 3 mm glass tube can reach 92%
3. Temp. difference can reach 1000°C.
Physical Properties:
| Coefficient of expansion (20°C–30°C) | 0.57×10^-6/℃ |
| Density | 2.65g/cm3 |
| Refractive index | (Sodium D line) 1.458 |
| Dielectric constant (1MHz, 20°C) | 3.8 - 4.1 |
| Specific heat (20°C) | 800J/kg°C |
| coefficient of heat conductivity(20°C) | 1.4-1.5W/m*K |
| Visible light transmission, 2mm thick glass | 93% |
| Strain temperature | 1100°C |
| Annealing temperature | 1150-1250°C |
| Softening point at which Borosilicate may deform | 1730°C |
| Temp. difference | 1000°C |
| Water resistance(ISO 719) | Class 1 |
| Acid resistance(ISO 195) | Class 1 |
| Alkali Resistance(ISO 695) | Class 2 |
Chemical Composition
| SiO2 | 99.9% |
| Impurity elements | ≦0.05% |
