Patent ID: 8877823

Claim:
A method for manufacturing a foamed article comprising: providing a composition comprising a melt-processable perfluoropolymer and talc, said perfluoropolymer comprising at least 50 percent by weight of said composition and said talc comprising, about 2 percent to 3 percent by weight of said composition; wherein said melt-processable perfluoropolymer is selected from the group consisting of tetrafluoroethylene/perfluoromethylvinyl ether copolymer (MFA), hexafluoropropylene/tetrafluoroethylene copolymer (FEP), perfluoroalkoxy (PFA) and any blend thereof, heating said composition to a processing temperature of at least 600° F. at which said talc functions as a chemical foaming agent, thereby causing the foaming of said composition at a foaming rate in a range from 20% to 50% so as to form a foamed article, wherein said talc is the only foaming agent in said composition and wherein said foaming is achieved without gas injection, and wherein hydrogen-containing fluoropolymers are absent from the composition.