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Product Name | Transparent Gauge Glass, Reflex Gauge Glass, level Gauge glass | |
Material | Borosilicate glass | |
Color | Normal Transparent, (Red, Green) | |
Density | 2.3-2.4 | g/cm3 |
Mohs Hardness | ≥7 | Grade |
Tensile strength | 4.8x107 | Pa(N/M2) |
Coefficient of expansion | (0-300°C) 3.3/4.2±0.1×10-6 | K-1 |
Poisson's ratio | 0.18 | |
Thermal conductivity | 1.2 | W·m-1·k-1 |
Softening point | 820±10 | °C |
Annealing point | 560°C | °C |
Strain point | 516±10 | °C |
Electrical resistivity | >1018 | Ωm |
Water resistance | I | ISO0719 |
Acid resistance | I | ISO0195 |
Alkali resistance | II | ISO0695 |

Size | ||||||||
No | L | B | S | Roman No | ||||
0 | 95 | 30/34 | 17/22 | - | ||||
1 | 115 | 30/34 | 17/22 | I | ||||
2 | 140 | 30/34 | 17/22 | II | ||||
3 | 165 | 30/34 | 17/22 | III | ||||
4 | 190 | 30/34 | 17/22 | IV | ||||
5 | 220 | 30/34 | 17/22 | V | ||||
6 | 250 | 30/34 | 17/22 | VI | ||||
7 | 280 | 30/34 | 17/22 | VII | ||||
8 | 320 | 30/34 | 17/22 | VIII | ||||
9 | 340 | 30/34 | 17/22 | IX | ||||
10 | 370 | 30/34 | 17/22 | X | ||||
11 | 400 | 30/34 | 17/22 | XI | ||||
Note | B=30 always named A type. B=34 always named B type, S=22 always named H type. | |||||||









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