HM Customized Low Thermal Expansion Pyrex Glass Tube
Properties:
- High temperature resistant, Borosilicate glass tube can work in 500°C with long time.
- Corrosion resistant, except hydrofluoric acid, Borosilicate glass tube do not react with any acid.
- Excellent thermal shock stability making them more dimensionally stable.
- High transmission to 85%
- Electric insulation ,it is 10000 times of usual glass.
- Low thermal expansion.
Photo
Parameter:
Physical Characteristics | Value |
Coefficient of mean linear thermal expansion α (20ºC; 300ºC) | 3.3·10-6 K-1 |
Transformation temperature Tg | 525ºC |
Glass temperature at viscosity η in dPa·s: | |
1013 annealing point | 560ºC |
107.6 softening point | 825ºC |
104 working point | 500ºC |
Maximum shot-time working temperature | 500ºC |
Density ρ 25ºC | 2.23g·cm-3 |
Modulus of elasticity E (Young's modulus) | 63·103N·mm-2 |
Poisson's ratio μ | 0.20 |
Thermal conductivity λw at 90ºC | 1.2W·m-1·k-1 |
Temperature for the specific electrical resistance of 108 Ω·cnm tk 100 | 250ºC |
Lagarithm of the electric volume resistivity (Ω·cm) at 250 Ω | 8 |
Lagarithm of the electric volume resistivity (Ω·cm) at 350 Ω | 6.5 |
Dielectric properties (1 MHz, 25) | |
Dielectric constant (permittivity) ε | 4.6 |
Dielectric loss factor (dissipation factor) tan δ | 37·10-4 |
Refractive index (λ=587.6nm) nd | 1.473 |
Stress-optical coefficient K | 4.0·10-6 mm2·N-1 |
Due to the corrosion resistant, high working tempertaure, low themal expression, sight glass is widely used to observe processes inside tanks, pipes, reactors, vessels.
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