Abstract
A method allowing the evaluation of fire retardancy properties is presented in the case of an intumescent formulation. In that case, the protection is obtained via a condensed mechanism. The method consists in the determination of invariant physicochemical parameters deduced from TG analysis : invariant activation energy and invariant preexponential factor. In the case of fire retardant polypropylene based formulation, there is a correlation between the value given by an evaluation test, i.e. the LOI (ASTM D 2863/77) and the invariant activation energy.
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