Thermal aging of a composition comprising a tetrafluoroethylene / perfluoro (alkyl vinyl ether) copolymer, wherein said alkyl contains from 1 to 5 carbon atoms, and melt flow polytetrafluoroethylene, Thermal deformation of the composition in the solid state, characterized by the epitaxial crystallization of the polymer components of the polymer, and other beneficial changes, e. G., An increase in continuous use temperature.
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