Fire Rated / Resistant Glass

There are a number of diffent types of fire rated and fire resistant glass on the market today. They are divided into two categories: fire rated glass for use in doors and windows which must meet fire code guidelines, and fire resistant glass for use in high-heat applications like fireplaces and intense spotlight lenses.

Naturally we carry a small selection of each. I suppose we wouldn't have this particular category on our website otherwise.

Fire Resistant Glass

Our fire-resistant glass comes in two varieties: Neoceram® and Pyroceram®. Both are transparent ceramic materials which are able to withstand temperatures in excess of 650°C (1200°F) for extended periods.

Pyroceram® measures approx. 1/8" or 3mm thick with very little tint or color. It is commonly used in commercial ovens, gas fireplaces, and outdoor lighting.

Neoceram® is a more robust 3/16" or 5mm thick, and has a yellowish-amber tint. It is ideally suited for use in fireplaces and wood stoves where the flame is less than seven inches from the glass.

Fire Rated Glass

Fire rated glass is one aspect of a building's fire control system. It's function is to contain fire and smoke, to delay or even prevent it spreading from one area of a building to another.

Ordinary plate glass can't withstand high temperatures. It usually breaks at around 120°C (250°F). Even tempered glass will break at approx. 260°C (500°F). In order to attain a fire rating, glass must withstand temperatures on the order of 870°C (1600°F) for a proscribed period of time (minimum 45 minutes in Canada, 20 minutes in the USA - Thanks to ML for this correction) and still remain in its frame. The glass is allowed to crack, provided it can still function as a barrier to smoke and flames. Georgian Wire glass is one such item.

This particular glass is available in two varieties: Georgian Polished Wire (GPW) and Georgian Cast Wire (GCW). GCW is an obscure glass - you can't readily see details through it, but you can make out vague shapes and it does transmit some light. GPW is basically GCW which has been ground smooth and clear allowing excellent transmission of light and a clear view. Both types have a mesh of steel wire embedded within. It is this wire that holds the glass together when it fails at high temperatures.

Both types are commonly found in schools, public stairwells, fire-escapes and interior entrances to garages or parking structures.

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