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Red Line Borosilicate Tube

Manufactured in borosilicate glass, it is used in numerous applications where both chemical resistance and low thermal expansion coefficient are required. The outer diameters of the level tube are available in various sizes from ½“ to 1½“ and lengths vary up to 144”.

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Manufactured in borosilicate glass, it is used in numerous applications where both chemical resistance and low thermal expansion coefficient are required. The outer diameters of the level tube are available in various sizes from ½“ to 1½“ and lengths vary up to 144”. The refmex-gl level tube is available in different wall thicknesses according to the pressure requirements of the equipment and is supplied with the ends cut with a diamond disc and squared off to ensure sealing and avoid sharp edges. The level tube is available in both red line and transparent.

The former gives a special optical effect where the red line between the two white sides magnifies the central line thus increasing the observation distance of the liquid.

Type of Crystal Borosilicate 3.3
Manufacturing parameters Manufacturing diameters 1/2”, 5/8”, 3/4”, 7/8”, 1”, 1-1/4”, 1-1/2”
Manufacturing thicknesses Standard wall, high pressure and extra reinforced
Minimum manufacturing length 10 mm
Maximum manufacturing length 3700 mm
Operating parameters Maximum constant working temperature 500°C
Maximum short-term temperature 560°C
Resistance to thermal shock 230 K
Maximum working pressure *** (DIN7080)
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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