Chanter Biomed stock a wide range of boiler inspection port glasses (see stock sizes listed below).

We can supply many other sizes. If the glass size that you require is not listed, please contact our sales office for a quotation.

Our standard inspection glasses are in toughened soda glass, but we can supply in borosilicate or even quartz glass if required.

Choice of inspection glass material.

As a guide, toughened soda is suitable for continual use up to about 250°C, or up to about 300°C for short periods.

Toughened Borosilicate glass is suitable for use up to about 400°C to 450°C.

If the temperature is even higher, then consider quartz glass, which can withstand temperatures as high as 1000°C to 1100°C.
Note that at these extreme temperatures, the choice of gasket material tends to be a bigger problem than the glass. Many gasket materials tend to break down before 900°C is reached, which is well before the glass runs into problems.

Coloured glass discs are suitable for use up to about 200°C.
If the temperature is expected to exceed 200°C, then the coloured glass should be protected by installing an additional heat resisting glass on the 'hot' side.