WT Glass transparent gauge Glass, also called oblong toughened glass panes, long form level gauge glass, made of borosilicate glass, particularly suitable for use in aggressive environments (acids, alkalis, water vapor), working temperature up to 350 °C, DIN7081.
Transparent glasses provide an uninterrupted view, ensuring precise level measurements and operational safety.
| Material | Borosilicate Glass |
|---|---|
| Standard | DIN7081 |
| Size | Length 115 to 400mm; Width 30mm; 34mm |
| Thickness | 17mm |
| Edge | Grind or Polish |
Length: 115-400mm;
Width: 30mm; 34mm;
Thickness: 17mm
Edge: Grind or Polish
| Glass Size (mm)
| Length l
| Thickness t
| Dimension “A” | Dimension “B” |
| Width b | Width b | |||
| 1 | 1151) | 17 | 30 | 34 |
| 2 | 140 | 17 | 30 | 34 |
| 3 | 165 | 17 | 30 | 34 |
| 4 | 190 | 17 | 30 | 34 |
| 5 | 2181) | 17 | 30 | 34 |
| 6 | 220 | 17 | 30 | 34 |
| 7 | 250 | 17 | 30 | 34 |
| 8 | 280 | 17 | 30 | 34 |
| 9 | 3001) | 17 | 30 | 34 |
| 10 | 320 | 17 | 30 | 34 |
| 11 | 340 | 17 | 30 | 34 |
| 12 | 370 | 17 | 30 | 34 |
| 13 | 400 | 17 | 30 | 34 |
1) – no DIN dimension!
General Tolerances:
| Limit deviations for | Width 30mm | Width 34mm | |
| Length ≤250 | Length>250 | Any length | |
| Length, l | ±0.8 | ±1.0 | 0, -1.5 |
| Width, b | ±0.8 | ±0.8 | +0.2, -0.8 |
| Thickness,t | ±0.5 | +1.5, -0.5 | ±0.5 |
Flatness (e):
l ≤165mm: 0.05mm
165mm < l ≤ 220mm: 0.08 mm
l > 220mm: 0.13mm
| 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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