Circular Sight Glass

The glass type you require depends on environmental conditions (temperature, pressure, aggressive media.)

The basic types of materials used for the manufacture of sight glasses are:

• soda-lime glass – widely available, working temperature up to 280 °C,
• borosilicate glass – particularly suitable for use in aggressive environments (acids, alkalis, water vapor), working temperature up to 350 °C,
• aluminosilicate glass – working temperature up to 750 °C,
• glass-ceramics – thermal shock resistant, working temperature up to 750 °C,
• quartz glass – with a broad spectrum light transmittance (from ultraviolet to infrared), working temperature up to 1200 °C,
• sapphire products – working temperature up to 2000 °C.

To improve the strength, the machined glass in certain circumstances can subjected to toughening and annealing.

In order to increase the resistance of sight glasses on the aggressiveness of the working environment and in the use of high temperatures and pressures, a mica shield is recommended. Mica disc working as shields are described here. If you need this solution – please contact us. Circular sight glasses are delivered separately or in a set with gaskets