WT Glass Redline tubular gauge glass, also called redline gauge glass tube is made of borosilicate glass, particularly suitable for use in aggressive environments (acids, alkalis, water vapor). We have both standard size used in low pressure environment and heavy wall size used in high pressure environment in normal outer diameter 1/2″ , 5/8″, 3/4″ and the tube can be cut to any desired length needed.
| Material | Borosilicate Glass |
|---|---|
| Outer diameter | 4mm to 315mm; standard 1/2" , 5/8", 3/4" |
| Thickness | 0.8 to 12mm |
| Length | 9.5mm to 1500mm; Glass can be cut to any desired length needed |
| Edge | Grind or Polish |
Redline tubular gauge glass also called redline gauge glass tube has a red line between two white lines which, in the presence of a colorless liquid, magnifies the red line. The bold red line makes it easier to read the liquid level.
Redline tubular gauge glass can be divided into standard size and heavy wall size according to the wall thickness. The standard size tubular glass is commonly used in low pressure boiler, tanks, reservoirs and some other low pressure instruments. The heavy wall kind is suitable to high pressure environment, such as crude oil and water, gas flow meter or acid and alkali containers.
Redline tubular gauge glass is made of borosilicate glass, which is a type of glass with silica and boron trioxide as the main glass-forming constituents. It features with very low coefficients of thermal expansion (3.3 × 10-6 at 20 °C) and much higher resistant to thermal shock than any other glass material.
Outer diameter: 4mm to 315mm, for redline tubular gauge glass, the standard outer diameter is OD1/2″ , OD 5/8″, OD3/4″.
Length: 9.5mm to 1500mm; Glass can be cut to any desired length needed
Thickness: 0.8 to 12mm
Edge: Grind or Polish
| Chemical Performance | |||||
| 1 | SiO2 | B2O3 | Na2O | Al2O3 | Fe2O3 |
| 80.3% | 13.04% | 4.17% | 2.44% | 0.027% | |
| 2 | Water resistance | ISO0719 I | |||
| 3 | Acid resistance | ISO0195 I | |||
| 4 | Alkali resistance | ISO0695 II | |||
| Mechanical Performance | |||||
| 5 | Density ρ | 2.2250g/cm3 @24℃ | |||
| 6 | Bending Strength | 150N/mm2 | |||
| 7 | Surface compressive stress | 90N/mm2 | |||
| 8 | Young’s modulus | 64 GPa | |||
| 9 | Poisson’s ratio | 0.2 | |||
| 10 | Hardness | 5.5 Mohs, (470 Knopp, 580 Vickers) | |||
| 11 | Elastic Modulus | 67KNmm-2 | |||
| Thermodynamic Performance | |||||
| 12 | Thermal Expansion Coefficient (0-300℃）(20-300) | ≤3.3*10-6K-1 | |||
| 13 | Softening Point | 820±10℃ | |||
| 14 | Strain Point | 520±10℃ | |||
| 15 | Annealing Point | 560±10℃ | |||
| 16 | Caloricity (20-100℃) | 0.83KJ* (kgxK)-1 | |||
| 17 | Thermal Coefficient | 1.2WxmxK-1 | |||
| 18 | Thermal Shock Resistance | 180K | |||
| 19 | Max Working Temperature | -70 up to 500℃ Short time (＜10h） | |||
| 20 | Max Working Temperature | -70 up to 280℃ Long time (＞10h） | |||
| Eletric Property | |||||
| 21 | Electric Volume Resistivity | 8.6×1013Ωxcm (at 25℃） 1.4×106Ωxcm (at 300℃） 1.4×10 6Ωxcm (at 300℃） | |||
| 22 | Dielectric Dissipation Fraction | 38×10-4 (at 1MHz, 20℃） | |||
| 23 | Dielectric Constant εr | 4.6 (at 1MHz, 20℃） | |||
| Optical Property | |||||
| 24 | Refractive Index | 1.4714 @24℃ | |||
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