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Borosilicate glass according to DIN ***0.

For compressive stress with temperatures borosilicate circular sight glass up to max. **0 degrees Celsius,

Where a greater degree of chemical resistance or higher operating temperatures are required, a borosilicate glass should be specified. In a toughened form, temperatures up to **5 degrees Celsius are possible whilst annealed glass may be used up **0 degrees Celsius continuously with a short term maximum of **0 degrees Celsius.

In addition to standard DIN sizes, glasses are available in a wide range of diameters up to *0mm thick (see annular edge sight glass).