Abstract: A fluororesin tube 30 of the present invention has a tensile strength of 80 N/mm2 or more in both of the circumferential direction and the axial direction. The fluororesin tube 30 is produced by winding with two or more turn of a fluororesin film 20 having a thickness T of 2.5 ?m or less (particularly 2.0 ?m or less) to form a lamination. At least an outermost layer of the tube is fused to a layer immediately thereunder and a rising height H of the fluororesin film at the end-of-winding side 21 is always 0.1 ?m or more and 2.0 ?m or less when measured at any position of the side 21. A level difference D of the end-of-winding side 21 of the fluororesin tube is preferably more than or equal to sum of the film thickness T and 0.1 ?m, and less than or equal to 3.0 ?m (particularly 2.3 ?m) when measured at any position of the side 21.

Abstract: The present invention is tubular article comprising a polytetrafluoroethylene-based fluorine resin as a constitutional element, wherein the article has a maximum wall thickness of 20 ?m or smaller, and satisfies the following (1) and/or (2) properties. (1) Tensile elastic moduli in a circumferential direction and a tube axial direction are both 900 N/mm2 or more. (2) Tensile stresses at 5% elongation in a circumferential direction and a tube axial direction are both N/mm2 or greater. When this fluorine resin tubular article is used as a superficial layer of a fixing roll or a fixing belt, excellent durability can be exerted.

Abstract: Polytetrafluoroethylene thin film comprising a thin film of polytetrafluoroethylene having thickness of ?20 ?m; surface roughness (Ra) of ?0.1 ?m; tensile strength of ?80 N/mm2; and light beam transmittance of ?80% for light of 500 nm wavelength. A process for manufacture of polytetrafluoroethylene film comprising compressing porous polytetrafluoroethylene film at a temperature above the melting point of the film, followed by cooling to a temperature below the melting point of the film while continuing to apply pressure.

Abstract: There is described a fluororesin tubular product suitable for the surface layer of a fixing roll or a fixing belt for electrophotography. The tubular product of the present invention is a fluororesin tubular product formed by rolling, layering, and sticking a dense fluororesin film, wherein the number of rolling of the film is 2 or higher.

Abstract: Polytetrafluoroethylene thin film comprising a thin film of polytetrafluoroethylene having thickness of ≦20 &mgr;m; surface roughness (Ra) of ≦0.1 &mgr;m; tensile strength of ≧80 N/mm2; and light beam transmittance of ≧80% for light of 500 nm wavelength. A process for manufacture of polytetrafluoroethylene film comprising compressing porous polytetrafluoroethylene film at a temperature above the melting point of the film, followed by cooling to a temperature below the melting point of the film while continuing to apply pressure.