The present invention provides a material based on high density polytetrafluoroethylene (PTFE) and its applications, such as in the production of electric cable. The PTFE material of the invention includes PTFE, a metal oxide, a lubricant and a wetting agent.

A fluoropolymer composite film wire or cable wrap comprises an outer layer of expanded polytetrafluoroethylene (ePTFE) and an inner layer of melt processable fluoropolymer film. The inner and outer layers are laminated with each other in tape form, such as by the application of heat and/or pressure thereto. The fluoropolymer composite tape is wrapped about one or more wires or cables, and is heated or sintered after wrapping to bond the tape to the wire or cable, and bond the tape to itself at the seams.

An insulating coating material including an insulating film, and an adhesion layer on at least one side of an insulating film. The insulating film satisfies Formula (1) a=k×b.sup.3 . . . Formula (1) where a is a loop stiffness value in g/cm of the insulating film, b is a thickness in μm of the insulating film, and k is 0.000105 or more.

An insulating coating material including an insulating film, and an adhesion layer on at least one side of an insulating film. The insulating film satisfies Formula (1) a=k×b.sup.3 . . . Formula (1) where a is a loop stiffness value in g/cm of the insulating film, b is a thickness in μm of the insulating film, and k is 0.000105 or more.

A manufacturing method of a screening tape for using in an unshielded signal transmission cable without a drain wire for transmitting analog or digital signals comprises the following steps: providing an insulating substrate having a continuous flat surface; providing a continuous conductive layer; providing an adhesion layer in a discontinuous manner on the continuous flat surface of the insulating substrate or on the continuous conductive layer; bonding the continuous conductive layer and the insulating substrate through the adhesion layer to form a laminated structure comprising the insulating substrate, the adhesion layer, and the continuous conductive layer; and stretching the laminated structure in a longitudinal direction of the laminated structure to divide the conductive layer into multiple discrete conductive blocks that are mechanically and electrically isolated from each other.

A two-wire line includes a first conductor. A first dielectric thread is wrapped around the first conductor. The two-wire line includes a second conductor. A second dielectric thread is wrapped around the second conductor. The first conductor and the second conductor are at a distance from one another. The distance is smaller than the sum of the thickness of the first thread and the thickness of the second thread.

A two-wire line includes a first conductor. A first dielectric thread is wrapped around the first conductor. The two-wire line includes a second conductor. A second dielectric thread is wrapped around the second conductor. The first conductor and the second conductor are at a distance from one another. The distance is smaller than the sum of the thickness of the first thread and the thickness of the second thread.

Methods and apparatus are disclosed. The apparatus includes a substantially cylindrical mount body (350) comprising a first open mouth at a first end of the cylindrical body (350) and a further open mouth at a remaining end of the cylindrical body, a substantially cylindrical inner surface, and an outer surface that includes a plurality of spaced apart substantially parallel recessed regions that extends circumferentially around the body, wherein the cylindrical body (350) is tapered at each end and at least one securing element is located between the recessed regions.

Methods and apparatus are disclosed. The apparatus includes a substantially cylindrical mount body (350) comprising a first open mouth at a first end of the cylindrical body (350) and a further open mouth at a remaining end of the cylindrical body, a substantially cylindrical inner surface, and an outer surface that includes a plurality of spaced apart substantially parallel recessed regions that extends circumferentially around the body, wherein the cylindrical body (350) is tapered at each end and at least one securing element is located between the recessed regions.

A flexible pipe body and a method of providing electrical continuity are disclosed. The flexible pipe body comprises a first armour layer formed from a helical winding of a metal tape element, a further armour layer formed from a helical winding of a further metal tape element, and at least one intermediate layer between the first and further armour layers, said intermediate layer comprising a helically wound electrically insulating tape element (800.sub.0, 800.sub.1, 800.sub.2, 800.sub.3, 800.sub.4) and a helically wound electrically conductive tape element (810.sub.0, 810.sub.1, 810.sub.2, 810.sub.3, 810.sub.4).