NOVELTY - The method comprises wrapping an unsintered or partially sintered expanded polytetrafluoroethylene (ePTFE) membrane around a first mandrel or a form tool to form an ePTFE tube, matting the tube, sintering the matted ePTFE tube, removing the sintered ePTFE tube from the first mandrel or form tool, stretching the sintered ePTFE tube in an axial direction, and wrapping a second unsintered or partially sintered ePTFE membrane around the axially stretched ePTFE tube positioned on a second mandrel for creating a multilayered ePTFE tube.    USE - The method is useful for making a thin walled ePTFE tube, which is useful for medical application including endovascular devices and hearing aid device diaphragms and for industrial application including a fuel cell membrane electrode assembly.    ADVANTAGE - The method is capable of economically making the thin walled ePTFE tube with improved axial and radial strength, low friction coefficient, minimal or no seam line visibility and good bonding properties.    DETAILED DESCRIPTION - The method comprises wrapping an unsintered or partially sintered expanded polytetrafluoroethylene (ePTFE) membrane around a first mandrel or a form tool to form an ePTFE tube, matting the tube, sintering the matted ePTFE tube, removing the sintered ePTFE tube from the first mandrel or form tool, stretching the sintered ePTFE tube in an axial direction, and wrapping a second unsintered or partially sintered ePTFE membrane around the axially stretched ePTFE tube positioned on a second mandrel for creating a multilayered ePTFE tube. The step of wrapping the second ePTFE membrane around the axially stretched tube comprises matting the multilayered ePTFE tube, sintering the matted multilayered ePTFE tube, and removing the sintered multilayer ePTFE tube from the second mandrel. The step of stretching the tube in the axial direction includes reducing the diameter of the ePTFE tube, reorienting the strength of the ePTFE tube from radial to axial, and stretching the tube to finished radial size. The step of stretching the tube to finished radial size comprises inserting the second mandrel into the ePTFE tube for radially stretching the ePTFE tube. A diameter of the second mandrel is larger than a diameter of the reduced diameter ePTFE tube and less than a diameter of the first mandrel. The step of stretching the tube in the axial direction further comprises heating the ePTFE tube before axial stretching. The step of heating the ePTFE tube before axial stretching includes restraining the tube ends between clamps, and heating the clamped ePTFE tube with convection, radiant or conductive heat source. The step of matting the ePTFE tube includes reducing the thickness (60-75%) of the tube, wetting the ePTFE tube including the step of spraying the wettable liquid on top of the ePTFE tube with a sprayer, and drying the wetted ePTFE tube including heating the tube under a preheat heater for removing the wettable liquid and forming a matted ePTFE tube, where the wettable liquid consists of an alcohol and a mineral solvent. The step of sintering the matted ePTFE tube including heating the ePTFE tube in a high temperature oven to a sintering temperature. The unsintered or partially sintered ePTFE membrane is provided by mixing (14) a fine powder polytetrafluoroethylene resin with a lubricant creating a mix, compressing (16) the mix into a preform mold, extruding (18) the molded mix into a tape, calendering (20) the extruded tape, evaporating (21) the lubricant from the extruded tape, stretching (22) the calendered tape in the machine direction, and optionally stretching the calendered tape in the transverse direction for forming a unsintered or partially sintered ePTFE membrane. An INDEPENDENT CLAIM is included for a multilayered thin walled ePTFE tube.    DESCRIPTION OF DRAWING(S) - The diagram shows a flow chart of a method of making an ePTFE membrane or tube.    Providing an unsintered or sintered ePTFE membrane (12)    Mixing fine powder ePTFE with lubricant (14)    Compressing ePTFE and liquid into a preform mold (16)    Extruding mold into a tape (18)    Calendering extruded tape (20)    Evaporating lubricant (21)    Stretching calendered tape in the machine direction. (22)