A solution for limiting the furning mechanism can consist in developing on the outer surface of the polymer a glassy [1] or an expanded shield [2-3] which may at least partially,limit the transfer of fuel to the gas phase,the transfer of heat from the flame to the condensed phase and eventually oxygen diffusion in the condensed phase.In particular,fire retardant intumescent materials are halogen-free and form on heating foamed cellular charred layers on the surface,which protect the underlying material from the action of the heat flux from a flame or external source.
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