Main Characteristics:Once the hydrates are spent, the temperature on the unexposed side of an endothermic fire barrier tends to rise rapidly. Too much water can be a problem, however. Concrete slabs that are too wet,will literally explode in a fire, which is why test laboratories insist on measuring water content of concrete and mortar in fire test specimens, before running any fire tests. PFP measures can also includeintumescentsandablativematerials. The point is, however, that whatever the nature of the materials, they on their own bear no rating. They must be organised into systems, which bear a rating when installed in accordance with certification listings or established catalogues, such as DIN 4102 Part 4 or the Canadian National Building Code. Passive Fire Protection measures are intended to contain a fire in the fire compartment of origin, thus limiting the spread of fire and smoke for a limited period of time, as determined the localbuilding codeand fire code. Passive fire protection measures, such as firestops, fire walls, and fire doors, are tested to determine thefire resistancerating of the final assembly, usually expressed in terms of hours of fire resistance (e. g. , ⅓, ¾, 1, 1½, 2, 3, 4 hour). Acertification listingprovides the limitations of the rating. Contrary toactive fire protectionmeasures,passivefire protection means do not typically require electric or electronic activation or a degree ofmotion. Exceptions to that particular rule of thumb are fire dampers (fire-resistive closures within air ducts, excluding grease ducts) and fire door closers, whichmustmove, open and shut in order to work, as well as all intumescent products, which swell, thus move, in order to function. As the name suggests, passive fire protection (PFP) remains silent in your coating system till the eventuality of a fire