A sealing member containing a copolymer containing tetrafluoroethylene unit and a perfluoro(propyl vinyl ether) unit, wherein the copolymer has a content of the perfluoro(propyl vinyl ether) unit of 2.7 to 4.5% by mass with respect to the whole of the monomer units, a melt flow rate of 26 to 42 g/10 min, and the number of functional groups of —CF═CF.sub.2, —CF.sub.2H, —COF, —COOH, —COOCH.sub.3, —CONH.sub.2 and —CH.sub.2OH of more than 50 per 10.sup.6 main-chain carbon atoms. Also disclosed is a power storage assembly including the sealing member.

There is provided a copolymer containing tetrafluoroethylene unit and perfluoro(propyl vinyl ether) unit, wherein the copolymer has a content of perfluoro(propyl vinyl ether) unit of 3.3 to 4.2% by mass with respect to the whole of the monomer units, the melt flow rate at 372° C. of 27.0 to 35.0 g/10 min, and the number of functional groups of 20 or less per 10.sup.6 main-chain carbon atoms.

There is provided a copolymer containing tetrafluoroethylene unit and perfluoro(propyl vinyl ether) unit, wherein the copolymer has a content of perfluoro(propyl vinyl ether) unit of 4.8 to 5.7% by mass with respect to the whole of the monomer units, a melt flow rate at 372° C. of 33.0 to 39.0 g/10 min, and the number of functional groups of 50 or less per 10.sup.6 main-chain carbon atoms.

The present disclosure provides an electric cable, comprising two signal conductors, a resin insulating layer, an expanded polytetrafluoroethylene insulating film, an electromagnetic shielding film, two ground conductors, and a covering layer. The resin insulating layer covers the two signal conductors. The expanded polytetrafluoroethylene insulating film covers the resin insulating layer. The electromagnetic shielding film covers the expanded polytetrafluoroethylene insulating film. The two ground conductors are disposed at two sides of the electromagnetic shielding film. The cladding layer dads the electromagnetic shielding film and the two ground conductors. Through the expanded polytetrafluoroethylene insulating film, the electric cable can be applied to compact products, and the electric cable can be highly flexible such that the signal transmission performance would not be affected after being repeatedly bent.

The present disclosure provides an electric cable, comprising two signal conductors, a resin insulating layer, an expanded polytetrafluoroethylene insulating film, an electromagnetic shielding film, two ground conductors, and a covering layer. The resin insulating layer covers the two signal conductors. The expanded polytetrafluoroethylene insulating film covers the resin insulating layer. The electromagnetic shielding film covers the expanded polytetrafluoroethylene insulating film. The two ground conductors are disposed at two sides of the electromagnetic shielding film. The cladding layer dads the electromagnetic shielding film and the two ground conductors. Through the expanded polytetrafluoroethylene insulating film, the electric cable can be applied to compact products, and the electric cable can be highly flexible such that the signal transmission performance would not be affected after being repeatedly bent.

Disclosed are cable types, including a type THHN cable, the cable types having a reduced surface coefficient of friction, and the method of manufacture thereof, in which the central conductor core and insulating layer are surrounded by a material containing nylon or thermosetting resin. A silicone based pulling lubricant for said cable, or alternatively, erucamide or stearyl erucamide for small cable gauge wire, is incorporated, by alternate methods, with the resin material from which the outer sheath is extruded, and is effective to reduce the required pulling force between the formed cable and a conduit during installation.

Embodiments of this application provide an optical/electrical hybrid cable and an optical communications system, and relate to the field of optical communications technologies. The optical/electrical hybrid cable includes a linear conductor, an optical fiber, and an outer sheath. The outer sheath tightly wraps exteriors of the conductor and the optical fiber, and the conductor and the optical fiber are arranged side by side. According to the optical/electrical hybrid cable and the optical communications system provided in the embodiments of this application, on the premise that an optical fiber cable and a power cable that are separated can be formed, a structure is simple, a manufacturing process is simplified, and an area of a cross section of the optical/electrical hybrid cable is reduced.

A modified polytetrafluoroethylene which can be formed under a low extrusion pressure and with which changes of the extrusion pressure are suppressed, even in paste extrusion at a high RR ratio, and its production method. The modified polytetrafluoroethylene having units based on tetrafluoroethylene, 0.020 to 0.040 mass % of units based on a monomer represented by the following formula (1), and 0.003 to 0.080 mass % of units based on a monomer represented by the following formula (2), each based on all units of the modified polytetrafluoroethylene. The monomers of formulae (1) and (2) are represented by: CH.sub.2═CH—C.sub.nF.sub.2n+1 (1), wherein n is from 2 to 6; and CF.sub.2═CFO(LO).sub.mRf (2), wherein L is a perfluoroalkylene group, Rf is a perfluoroalkyl group, and m is an integer of from 0 to 4.

An automotive communications cable includes a cable jacket, a pair of twisted conductors disposed within the cable jacket, and two or more insulating strands disposed within the cable jacket. The two or more insulating strands include a central insulating strand disposed between a first conductor in the pair of twisted conductors and a second conductor in the pair of twisted conductors.

A cross-linkable composition includes an elastomeric fluoropolymer and a semi-crystalline fluoroplastic. The composition enables manufacturing of articles which maintain favorable mechanical properties (e.g. tensile strength, elongation and flexibility) when continuously exposed to extreme temperatures. In addition, a cross-linked product obtained by subjecting said composition to ionizing radiation is disclosed, which may be used in heat-shrinkable articles, cable jackets and sealing elements.