Fire-rated glass partitions explained: E30, EI30, E60 and EI60
Fire-rated glass partitions are classified by how long they resist fire and how. E means integrity, stopping flames and hot gases; EI means integrity and insulation, also limiting heat on the safe side. The number is the minutes achieved in a test, usually 30 or 60. The rating applies only to the tested combination of glass, frame, seals and fixings.
When do you need E and when EI?
E-rated glass lets heat radiate through while stopping flames, so it is generally limited in size and position on escape routes. EI-rated glass keeps the protected side cool enough for people to use the route, so it is often required on protected corridors and stairs. The fire strategy for your building sets which applies.
Why must the whole system be tested?
A fire-rated pane in an untested frame may fail early because the frame or seals give way first. Ratings come from tests to BS 476-22 or BS EN 1364-1 for screens, and BS EN 1634-1 for doors, on the complete assembly. We supply and fit tested combinations and provide the evidence.
What about fire-rated doors?
Glazed fire doors must be supplied as a doorset with tested hardware, a suitable closer, intumescent seals and often smoke seals. Changing a handle or adding a lock that was not part of the test can invalidate the rating.
