Patent ID: 7455301

Claim:
A seamless corrugated insert gasket comprising: first and second annular rings comprising a polymer selected from the group consisting of PTFE, porous PTFE, expanded PTFE, filled PTFE and microcellular PTFE, the first and second rings having an inside diameter and an outside diameter, wherein the width of the first and second rings is the radial distance from the inside diameter to the outside diameter; an insert comprising a third annular ring of corrugated metal, the insert having an inside diameter greater than the inside diameter of the first and second rings and an outside diameter less than the outside diameter of the first and second rings; wherein the insert is sandwiched between the first and second rings, and further wherein the first and second rings are unified around the insert to form a unitary polymer construction that fully encases the insert in a seamless fashion and wherein the density of the unitary polymer construction of the finished gasket is between about 0.5 and 2.0 gm/cc; whereby the gasket is seamless including a seamless inside diameter and a seamless outside diameter.