Fire resistant insulation glazing can be categorized in terms of their performance level (duration of the fire resistance and the method of insulation). The choice is made on the basis of various criteria with regard to the valid regulations and taking into account the eventual application of the glazing. The fire resistant of glazing rests on three basic criteria: Mechanic stability The fire resistant element should retain its mechanic stability during and after the test.
Flames or flammable gasses should not leak through the cracks and joints in the construction.
The temperature on the construction to the public side can rise no more than 140°C on average or 180°C on one point, also when the temperature in the oven is 821°C after 30 minutes and 925°C after 60 minutes. The fire tests have only been rewritten in accordance with the European norms :
- E - brandstabiliteit
- Ew - brandstabiel met beperking van warmtestraling
- EI - brandstabiel en isolerend tegen de hitte
When a fire breaks out in a building, the people present need to be able to escape. This happens via a part of the building where the fire does not expand. Splitting up the building into various parts (compartments) is needed. The government and the fire department impose fire compartments and escape routes. In order to prevent the fire from spreading to another compartment, fire resistant construction materials need to be used. The increasing norms concerning fire safety demand more and more of the use of "fire resistant" glazing for publicly accessible buildings (hospitals, schools, administrative buildings,…). These have been validated in time periods per hour (1/4hr, 1/2hr, 1hr, 1hr1/2, 2hr).