Classification of fire rated systems

Fire rating is the ability of a construction or building element to withstand for a defined amount of time against the thermal results of a fire, without the loss of integrity or/and insulation.

INTEGRITY AND STABILITY
(E RATING)

No flames or hot gases on the non-fire side

INTEGRITY, STABILITY AND RATIATION PROTECTION
(EW RATING)

Same as E plus measured radiated heat in front of the glazing many not exceed 15 kW/m²

INTEGRITY, STABILITY AND INSULATION PROTECTION
(EI RATING)

Heat shield function. On average the temperature may not exceed 140°C above the initial temperature on the non-fire side of the glazing

Integrity E is the ability of the element of construction that has a separating function, to withstand fire exposure on one side only, without the transmission of fire to the unexposed side as a result of the passage of flames or hot gases. They may cause ignition either of the unexposed surface or of any material adjacent to that surface.

Radiation is the ability of the element of construction to withstand fire exposure on one side only, so as to reduce the probability of the transmission of fire as a result of significant heat either through the element or from its unexposed surface to adjacent materials. The element may also need to protect people in the vicinity. An element which satisfies the insulation criterion I is also deemed to satisfy the W requirement for the same period.

Insulation I is the ability of the element of construction to withstand fire exposure on one side only, without the transmission of fire as a result of significant transfer of heat from the exposed side to the unexposed side. Transmission shall be limited so that neither the unexposed surface nor any material in close proximity to that surface is ignited. The element shall also provide a barrier to heat, sufficient to protect people near to it.