Integrity & Radiation Control glass: Class EW
Minimizes the transmission of radiant heat while stopping flames, smoke, hot and toxic gases.
About EW Rating
Class EW (Integrity & Radiation) rating is also a measure of Integrity performance, the ability to stop the spread of flames, smoke, and gasses through the unexposed side of a fire, with the addition of the ability to minimize radiant heat transfer from the fire side to the unexposed side. Class EW glass reduces the risk of fire transmission caused by radiant heat and thereby can allow for safer passage of building occupants making exit past the glass.
Class EW (Integrity & Radiation) rated glass is classified in accordance with European standard EN 13501-2, Fire classification of construction products and building elements, to withstand fire exposure from one side and ensure that the radiant heat transfer measured on the unexposed side of the glass remains below a specific value for a certain period of time. This time (the classification period) is declared in minutes using specific periods (30, 60, 90, etc…). A Class EW fire-rated glass with a 120 minute classification period will be declared as a EW120 product. Fire rated systems are tested in accordance with EN 1364-1 (for partitions) and EN 1634-1 (for openable windows and doors).
Performance criteria for EW = Integrity + Radiation rating:
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No sustained flames on the side not exposed to fire
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No openings larger than Ø 25 mm or 6 x 150 mm
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Heat flux (radiation) not exceeding 15 kW/m² measured at 1 m distance
Related Classification
Class EI
Class EI (Insulation) fire-rated glass is the highest performance classification and blocks the transfer of heat while stopping flames, smoke, hot and toxic gases.
Class E
Class E (or Integrity only) fire-rated glass provides a barrier against the passage of flames, smoke, and hot, toxic gases.
