How does fire rated glass work?

It typically consists of multiple layers of glass with intumescent interlayers. When exposed to heat, these interlayers expand rapidly, forming an opaque, insulating barrier that prevents fire and heat transfer.

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Fire rated glass(which is often referred to as fire-resistant glass,fire protection glass,anti fire glass or fireproof glass) is a specialized glazing product designed to act as a barrier against fire, smoke, and heat transfer for a specified period, helping to contain a fire and allow safe evacuation.
EN 13501-2 is the European standard for the fire classification of construction products and building elements, used to classify fire-rated glass based on its performance in fire resistance tests.
Fire resistance refers to the ability of a material or assembly to withstand fire, while fire rating is the specific time (e.g., 60 minutes) for which it can maintain its performance under test conditions.