They are used on pipelines during transportation of liquid and powder fluid for flow control. Control glass are made ​from borosilicate glass, chemically resistant, resistant to changes in temperature, abrasion, of extremely equal wall thickness which guarantee high-quality flow and long service life.

Control glass is made in stated diameters and lengths upon request of customers perpendicularly cut and finely polished front surfaces without microcraks and thermal stresses.

Outer diameter-D(mm)	Wall thickness-t(mm)	Length-L(mm)
40.0 ± 0.8	3.2 ± 0.3	30 - 3000
40.0 ± 0.8	5.0 ± 0.4	30 - 3000
50.0 ± 1.0	5.0 ± 0.4	50 - 3000
55.0 ± 1.0	5.0 ± 0.4	50 - 3000
60.0 ± 1.2	5.0 ± 0.4	50 - 3000
65.0 ± 1.2	5.0 ± 0.4	50 - 3000
70.0 ± 1.2	5.0 ± 0.4	50 - 3000
75.0 ± 1.2	5.0 ± 0.4	60 - 1490
80.0 ± 1.5	5.0 ± 0.5	60 - 1490
85.0 ± 1.5	5.0 ± 0.5	60 - 1490
90.0 ± 1.5	5.0 ± 0.5	60 - 1490
95.0 ± 1.5	5.0 ± 0.5	60 - 1490
100.0 ± 1.5	5.0 ± 0.5	70 - 1490
105.0 ± 1.8	5.0 ± 0.5	70 - 1490
110.0 ± 1.8	5.0 ± 0.5	70 - 1490
115.0 ± 1.8	5.0 ± 0.5	80 - 1490
120.0 ± 1.8	5.0 ± 0.5	80 - 1490
125.0 ± 1.8	5.0 ± 0.5	80 - 1490
130.0 ± 1.8	5.0 ± 0.5	80 - 1490
135.0 ± 1.8	5.0 ± 0.6	80 - 1490
140.0 ± 2.0	5.0 ± 0.6	80 - 1490
145.0 ± 2.0	5.0 ± 0.6	90 – 1490
150.0 ± 2.0	5.0 ± 0.6	90 – 1490
160.0 ± 2.0	5.0 ± 0.7	90 – 1490
170.0 ± 2.0	5.0 ± 0.7	90 – 1490
170.0 ± 2.0	7.0 ± 1.0	100 – 1400
180.0 ± 2.2	5.0 ± 0.7	100 – 1400
180.0 ± 2.2	7.0 ± 1.0	100 – 1400
200.0 ± 2.4	7.0 ± 1.0	100 – 1400
250.0 ± 3.0	7.0 ± 1.1	150 - 1490