About EW Glass Rating
The Class EW (Integrity & Radiation) rating defines both integrity performance and the ability to limit radiant heat transfer. This EW rating measures how effectively EW glass, including EW fire resistant glass, prevents the spread of flames, smoke, and gases to the unexposed side of a fire, while also minimizing radiant heat passing through the glass. By reducing the risk of fire transmission caused by radiant heat, EW fire safety glass supports safer passage for building occupants when exiting past glazed areas.
Class EW fire rated glass is classified in accordance with the European standard EN 13501-2, Fire classification of construction products and building elements. It is designed to withstand fire exposure from one side and ensure that radiant heat transfer on the unexposed side remains below a specified limit for a defined period. This classification period is expressed in minutes (such as 30, 60, or 90). For example, EW30 glass refers to EW glass with a 30-minute classification period.
Performance criteria for EW (Integrity + Radiation) rating include:
- No sustained flames on the side not exposed to fire
- No openings larger than Ø 25 mm or 6 × 150 mm
- Radiant heat flux not exceeding 15 kW/m², measured at a distance of 1 meter
Related Classification
EI Class
Blocks the transfer of heat while stopping flames, smoke, hot and toxic gases.
E Class
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