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REACTION TO FIRE The reaction to fire class is an indicator that provides an assessment of whether or not the material contributes to fire. Different material behaviours correspond to different classes, ranging from non-combustible products to extremely flammable materials. European classification according to EN 13501-1 class A1 non-combustible products classes A2, B, C, D, E combustible products, as their participation in the fire increases class F indicates materials with Non-Determined Performance (NDP) or that do not reach Class E s1, s2, s3 are the three values indicating the optical density of smoke d0, d1, d2 are the three values indicating the danger of dripping FIRE RESISTANCE Fire resistance indicates the ability of a building element to maintain structural stability during a fire condition for a given period of time, while retaining the ability to compartmentalise smoke and hot gases generated by combustion. The primary purpose of fire resistance is to ensure the load-bearing capacity of the structure under fire conditions. The characteristics that must be maintained during the action of fire are indicated by three letters: R load bearing ability of the building element to maintain structural stability under the action of fire E tightness ability of the construction element not to let flames, vapours nd hot gases pass through to the side not exposed to fire I thermal insulation ability of the construction element to limit heat transmission to the side not exposed to fire The fire resistance rating is expressed in minutes, during which resistance under the action of flames must be ensured:15, 20, 30, 45, 60, 90, 120, 180, 240 and 360 minutes. The indication of minutes follows the abbreviation REI (e.g. REI120). In the case of non-load-bearing structures, where the load-bearing capacity is not significant, the R factor can be omitted and the minutes can be expressed as EI (e.g. EI90). SUBSCRIBE Discover the different flame reactions of our products! Watch the video on our YouTube channel STRUCTURES AND FIRE BEHAVIOUR | 13
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