ULTRA PREVENT GRAPHITE TECHNOLOGY
Ultra prevENt graphite technology gives the highest fire performance without affecting the primary function or life expectancy of the membranes. During manufacture, the upper surface of the membrane base carrier (excluding the overlap area) is coated with expandable graphite crystals. This application concentration accounts for only 1% of the total weight of the membrane, thereby not affecting the waterproofing capability of the membrane construction. All types and weights of polyester base fabric can be provided with this expandable graphite, enabling this fire resistant technology to be offered with all prevENt cap sheets and vapour control layers. |
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Expandable graphite is a naturally occurring substance; it is very environment friendly, it is insoluble in water, and it functions as a flame retardant by endothermic combustion reaction when in contact with heat. With the heat of a fire the graphite expands, drawing the heat out the combustion process and creating a heat-insulating layer after expansion. The typical intumescent effect forms a barrier against the flames and hence the heat, stops the dripping of the coating from the underside of the roofing, and also acts as an effective smoke suppressant.