The Round Sight glasses are pressed, grinded, polished and thermally prestressed. They are used to observe the level and movement of the mediums:

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Technical data of material:

Borosilicate glass, thermally prestressed, optically tested, properties as defined in DIN and OENORM standards. Extract from this standard: "For safety reasons soda-lime based glasses may not be used".

Operating temperature:

Suitable for temperatures from -273°C up to +300°C

Glasses with dimensions 31,75/12,7 up to 356°C

Resistance of bending strain:

Equal or higher than 160N/mm2

Transition temperature:

tg=540°C

Alkali resistance:

Alkali class 2, tested acc. to DIN ISO 695

Water resistance:

Hydrolitic class 1, tested acc. to DIN ISO 719

Acid resistance:

Acid class 1, tested acc. to DIN ISO 1776

Standards:

OENORM M 7353, DIN 7080