Redline gauge glass tubeis a typical kind of glass tube for tubular gauge glass.
Redline glass tube have a red stripe in between two white stripes which makes a colorless liquid visible. It is widely used in liquid level gauge applications,such as steam boiler and liquid tank. Redline gauge glass tube is made of borosilicate glass which is a type of glass with silica and boron trioxide as the main glass-forming constituents. Borosilicate glass tubes are known for having very low coefficients of thermal expansion (3.3 × 10−6 K−1 at 20 °C), making them more resistant to thermal shock than any other common glass. Borosilicate glass tube is usually used in tubular level gauge for high temperature and pressure resistance, which is also known as tubular gauge glass, pyrex glass tube.
Physical Data of Redline Gauge Glass Tube
Medium coefficient of linear expansion α20/300 acc.To DIN 52328
3.3 ± 0.1
525 ± 15
Upper annealing temperature
560 ± 10
820 ± 10
1260 ± 20
Maximum short-time working temperature
20 degree Celsius Density ρ
2.23 ± 0.02
Modulus of elasticity E
Temperature for the specific electrical resistance of 108Ω·cm(DIN52326)tk 100