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Tempered Borosilicate Level Sight Glasses DIN7081

Made of borosilicate glass, it is used in numerous applications where both chemical resistance and low thermal expansion coefficient are required. For FLAT level indicators, a two-sided observation system is used, as direct observation through the glasses is allowed as the fluid rises or falls. These are mainly used in processes where the color of the liquid is of high importance for the process or applications that require a protective mica.

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Made of borosilicate glass, it is used in numerous applications where both chemical resistance and low thermal expansion coefficient are required. For FLAT level indicators, a two-sided observation system is used, as direct observation through the glasses is allowed as the fluid rises or falls. These are mainly used in processes where the color of the liquid is of high importance for the process or applications that require a protective mica.

Type of Crystal PSI °C
Non-corrosive fluid at room temperature, without steam, without chemical attack on the glass; in direct contact with the glass 4000 30
Non-corrosive fluid at room temperature, without steam, without chemical attack on the glass; in direct contact with the protective mica (only for flat sight glasses) 5000 300
Hot fluid or saturated vapor in direct contact with the glass 500 250
Hot fluid or saturated vapor in direct contact with the protective mica (only for flat sight glasses) 1500 300
Radio
r
Width
b
Length
l
Number 2 3 4 5 6 7 8m 9 10 11
30mm 15mm 140 mm 165 mm 190 mm 220 mm 250 mm 280 mm 320 mm 340 mm
34mm 17mm 5-1/2” 6-1/2” 7-1/2” 8-5/8” 9-7/8” 11” 12-5/8” 13-3/8” 370 mm 400 mm
Chemical properties Hydrolytic resistance HGB 1 (ISO 719)
Acid resistance Class S1 (ISO 1776)
Alkaline resistance Class A2 (ISO 695)
Chemical composition SiO2 Minimum 80% content
B2O3 Minimum 13% content
Na2O + K2O Minimum 4,5% content
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