Abstract: Molded preformed polytetrafluoroethylene structures are comprised of at least one preformed section. The homogeneous PTFE section yields a unitary non-homogeneous polytetrafluoroethylene structure when isostatically molded together with either polytetrafluoroethylene powders or polytetrafluoroethylene preformed sections.

Abstract: Method of molding granular polytetrafluoroethylene powder which comprises compressing the powder in a mold at a pressure of between about 10 and 50 bars to form a preform and subjecting the preform to isostatic molding at a pressure of between about 100 and 1000 bars.

Abstract: This invention relates to filled or charged tetrafluorethylene polymers and copolymers useful as molding or extrusion materials and to their use for the production of various products by lubrication extrusion. The filler and polymer or copolymer are mixed by grinding them together at a temperature of about -80.degree. to about +15.degree.C.

Abstract: Anti-adherent material for coming into contact with the epidermis such as sheets, surgical dressings, various kinds of bandages and the like are disclosed which comprise a homopolymer or copolymer of tetrafluoroethylene containing at least about 50% tetrafluoroethylene deposited upon a support material which is resistant to the fritting temperature of the homopolymer or copolymer, the support material containing from about 25 to 90% homopolymer or copolymer and from 10 to 75% support material and possessing regularly disposed perforations for from about 0.1 to 10% of the surface thereof.