Redline Gauge Glass Tube

Product Item：OV-011

Material: Borosilicate Glass 3.3

Colour: transparent

Use:observe liquid level

Size: Various

Description

Redline gauge glass tube is 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

No.	Physics Performance	Numerical Value	Unit
1	Medium coefficient of linear expansion α20/300 acc.To DIN 52328	3.3 ± 0.1	10-6K-1
2	Transformation Temperature	525 ± 15	Deg.C
3	Upper annealing temperature	560 ± 10	Deg.C
4	Softening point	820 ± 10	Deg.C
5	Working temperature	1260 ± 20	Deg.C
6	Maximum short-time working temperature	500	Deg.C
7	20 degree Celsius Density ρ	2.23 ± 0.02	g/cm3
8	Modulus of elasticity E	64	103 N/mm2
9	Poisson's ratio	0.20	1
10	Thermal productivity(20Deg.C-100Deg.C)	1.2	W/m2K
11	Temperature for the specific electrical resistance of 108Ω·cm(DIN52326)tk 100	250	Deg.C
12	Stress-optical constant(DIN52314)K	4.0	10-6mm2/N

Chemical Data of 3.3BorosilicateGlassTube

Composition	SiO2	B2O3	Na2O + K2O	Al2O3
approx.weight %	81	13	4	2
Water resistance to ISO720	1
Water resistance to European Pharmacopoeia	1
Water resistance to USP23	1
Acid resistance Class(DIN12116)	1
Alkali resistance Class(ISO695)	2