Abstract: A sealing element is provided which is formed of a fluorocarbon resin sheet and radially slit into two annular overlapping flaps to receive a garter spring or the like therebetween at a location adjacent to that peripheral portion of the element which is left solid and formed with a sealing edge. Despite the limited elasticity of the seal material per se, the sealing element, finally molded into shape, has an exceedingly high ability to follow the mating surface of a rotating shaft or other member of a mechanical assembly to be sealed. The followability of the sealing element is further improved on account of the slit formation of the element.

Abstract: A sealing element is provided which is formed of a fluorocarbon resin sheet and radially slit into two annular overlapping flaps to receive a garter spring or the like therebetween at a location adjacent to that peripheral portion of the element which is left solid and formed with a sealing edge. Despite of the limited elasticity of the seal material per se, the sealing element, finally molded into shape, has an exceedingly high ability to follow the mating surface of a rotating shaft or other member of a mechanical assembly to be sealed. The followability of the sealing element is further improved on account of the slit formation of the element.

Abstract: A method for molding a cover on a metal core by preforming cover segments and molding the latter to size with the core interposed therebetween. When molded, the preformed segments are gradually deformed and uniformly compacted to a high density particularly in regions in direct contact with the wall surfaces of the mold, with no inclusion of cracks, pinholes or other structural defects therein. The product molded in this manner exhibits a very high corrosion-resisting characteristic with no machining operation conventionally required thereon, particularly when molded of tetrafluoroethylene resin powder.