First, the efficiency of a mixture PU/APP as fire retardant in an ethylene-vinyl acetate matrix is investigated. It is shown that the fire performance is sharply improved. Second, the mechanism of fire retardancy of PU/APP is discussed considering the protective surface material, investigated by X-ray photoelectron spectroscopy. It is shown that APP contributes to the formation of the intumescent shield creating stable nitrogenated as well as phosphorus compounds via reaction with PU and/or with its degradation products. Such species modifies the mechanical properties of the shield resulting in an improvement of its fire retarding properties.
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