Patent ID: 7968613

Claim:
A foamable composition comprising: (i) one or more base perfluoropolymers comprising at least 50 percent by weight of said composition, wherein each of said perfluoropolymers is selected from the group consisting of tetrafluoroethylene/perfluoromethylvinyl ether copolymer (MFA), hexafluoropropylene/tetrafluoroethylene copolymer (FEP) and perfluoroalkoxy (PFA) and any blend thereof, and (ii) talc blended with said one or more base perfluoropolymers, said talc comprising 3 percent to about 15 percent by weight of said composition, wherein said one or more base perfluoropolymers are melt-processable at one or more elevated processing temperatures of at least about 600° F. at which the talc functions as a chemical foaming agent for extrusion or mold processing of the composition into a foamed article having uniform cell structure, wherein hydrogen-containing fluoropolymers are absent from the composition.