Glass as a material: safety with a view

Safety sight glasses made of borosilicate are used wherever safe optical inspections are essential, even at high pressures or under high chemical stress. Their high optical quality and low coefficient of thermal expansion make borosilicate glass an all-round talent in both industry and research.

Technical data:

Material:
Thermally toughened borosilicate glass.

Operating temperature:
Continuous use up to 280°C
Short-term load up to 300°C
Optionally with glow protection up to 320°C

Pressure resistance:
Very high. Depending on the dimensions. See glass calculator.

Chemical resistance:
Acid resistance according to DIN 12116 - acid class 1
Alkali resistance according to DIN 52332 - alkali class 2
Water resistance according to DIN ISO 719/720-hydrolysis class 1

Forms:
Round according to DIN 7080
Tongue-shaped according to DIN 7081
Stepped glasses, ground or glued
Any desired free form

Further information and data sheets can be found on our information page on borosilicate glass.

Sight glasses made of Tempax are preferred due to their excellent optical purity and high thermal resistance.
Comprehensive chemical resistance makes Tempax the glass of choice for all adverse areas of application in which no high pressure loads occur.


Technical data:

Material:
Borosilicate glass

Operating temperature:
Continuous use up to 450°C
Short-term load up to 500°C

Pressure resistance:
Low. Depending on the dimensions. See glass calculator.

Chemical resistance:
Acid resistance according to DIN 12116 - acid class 1
Alkali resistance according to DIN 52332 - alkali class 2
Water resistance according to DIN ISO 719/720-hydrolysis class 1

Forms:
Round
Rectangular
Tongue-shaped
Stepped glasses, cut or glued
Any desired free form

Further information and data sheets can be found on our Tempax information page.

Sight glasses made of Robax are often used as fire viewing panels due to their high temperature resistance.
This glass is characterized by excellent temperature difference resistance and high transparency.

Technical data:

Material:
Robax

Operating temperature:
Continuous use up to 610°C
Short-term load up to 660°C

Pressure resistance:
Low. Depending on the dimensions.

Chemical resistance:
Acid resistance according to DIN 12116 - acid class 3
Alkali resistance according to DIN 52332 - alkali class 2
Water resistance according to DIN ISO 719/720-hydrolysis class 1

Shapes:
Round
Rectangular
Tongue-shaped
Any desired flat free form

Further information and data sheets can be found on our Robax information page.

Sight glasses made of soda lime glass are preferred due to their excellent chemical resistance and cost efficiency.
These properties make soda lime glass the glass of choice for all adverse areas of application in which neither high temperatures nor high pressure loads occur.


Technical data:

Material:
Soda lime glass

Operating temperature:
Continuous use up to 70°C


Pressure resistance:
Low. Depending on the dimensions. See glass calculator.

Chemical resistance:
Acid resistance according to DIN 12116 - acid class 1
Alkali resistance according to DIN 52332 - alkali class 1
Water resistance according to DIN ISO 719/720-hydrolysis class 1

Shapes:
Round
Rectangular
Tongue-shaped
Stepped glasses, cut or glued
Any desired free form

Further information and data sheets can be found on our information page for soda lime.

Safety sight glasses made of pressed tempered glass are used wherever safe optical inspections are essential, even at high pressures or under high chemical stress. Their high chemical resistance and low cost make glasses made of thermally tempered soda lime glass a cost-effective solution in both industry and research.

Technical data:

Material:
Thermally toughened soda lime glass.

Einsatztemperatur:
Dauereinsatz bis 150°C

Pressure resistance:
Very high. Depending on the dimensions. See glass calculator.

Chemical resistance:
Acid resistance according to DIN 12116 - acid class 1
Alkali resistance according to DIN 52332 - alkali class 1
Water resistance according to DIN ISO 719/720-hydrolysis class 1

Shapes:
Round according to DIN 8902
Tongue-shaped according to former DIN 8903
Stepped glasses, ground or glued
Any desired free form

Further information and data sheets can be found on our information page on pressed hard glass.

Quartz glass plays a special role in the field of technical glass.

Highly temperature-resistant - up to 1150°C depending on the type of quartz - and conditionally pressure-resistant, it is ideal as a sight glass for high-temperature applications.

Another important property of quartz glass is its excellent transmission values.
Depending on the type and quality of the glass selected, the desired wavelengths can be observed or faded out.
This makes quartz glass ideal for laser measurement or observation.

For example, a quartz glass of grade JGS1 special is designed for the UV range and has a transmission rate at 185 nm of 90% or more.
It is an ideal optical glass in the 185 - 2500 nm range.

You can find more information on this and many other types of quartz glass on the specific information page on the subject of quartz glass.

We would also be happy to advise you personally on the use of this exciting material.