Patent ID: 8318819

Claim:
A foaming composition comprising: a foamable composition being melt processable at an elevated temperature of at least about 600 degrees F., said foamable composition comprising at least one fluoropolymer and talc or a talc derivative dispersed in said fluoropolymer; wherein each fluoropolymer is thermally processable at a temperature in a range of about 678 degrees F. to about 680 degrees F., wherein said talc or talc derivative is present in a concentration range of about 3 percent to about 15 percent by weight of said foamable composition and constitutes the only foaming agent present in the foamable composition and wherein said elevated temperature is sufficient to melt said at least one fluoropolymer and to cause said talc or talc derivative to foam, wherein said foaming composition is capable of being processed so as to form a foamed article comprising foamed cells having diameters in the range of about 0.0005 inches to about 0.003 inches, and wherein said foamed cells have a closed cell structure.