Abstract: A shaft seal of the type including an annular metal case and a flexible non-elastomeric sealing element such as polytetrafluoroethylene is made by molding a synthetic rubber filler ring between the metal case and the sealing element such that it bonds to both the metal case and to the sealing element, providing a faster and less expensive method of manufacturing the seal, while eliminating any leakage route between the metal case and the sealing element and also eliminating the I.D. to O.D. concentricity problem. In the embodiment where the sealing element is polytetrafluoroethylene, the filler ring chemically bonds to the metal case and mechanically bonds to the sealing element. Hydrodynamic pumping members can be molded onto the shaft engaging surface of the sealing element during the process of molding the synthetic rubber filler ring.

Abstract: A shaft seal of the type including an annular metal case and a flexible non-elastomeric sealing element such as polytetrafluoroethylene is made by molding a synthetic rubber filler ring between the metal case and the sealing element such that it bonds to both the metal case and to the sealing element, providing a faster and less expensive method of manufacturing the seal, while eliminating any leakage route between the metal case and the sealing element and also eliminating the I.D. to O.D. concentricity problem. In the embodiment where the sealing element is polytetrafluoroethylene, the filler ring chemically bonds to the metal case and mechanically bonds to the sealing element. Hydrodynamic pumping members can be molded onto the shaft engaging surface of the sealing element during the process of molding the synthetic rubber filler ring.