An electromagnetic shielding film for a cable, which relates to the field of wire manufacturing, for use in resolving the problem of easiness of break of the existing electromagnetic shielding film and the great consumption of time and power in the preparation process. The electromagnetic shielding film comprises a first metal layer (11,21,31,41), a conductive layer (12,22,32,42), and a protective film (13,23,33,43). The first metal layer covers the outer part of a conductor of a cable, and is used for shielding electromagnetic interference and is used as a medium. The conductive layer is disposed on the first metal layer, and is used for shielding electromagnetic interference, and the conductive layer comprises a curing agent, metal particles and polyurethane for carrying the metal particles. The protective film is disposed on the conductive layer and protects the electromagnetic shielding film.

A composite material that includes a layer of reinforcing fibres impregnated with a curable resin matrix and a plurality of electrically conductive composite particles positioned adjacent or in proximity to the reinforcing fibres. Each of the electrically conductive composite particles is composed of a conductive component and a polymeric component, wherein the polymeric component includes one or more polymers that are initially in a solid phase and are substantially insoluble in the curable resin, but is able to undergo at least partial phase transition to a fluid phase during a curing cycle of the composite material.

An insulator may include a first insulator portion that is structurally configured to receive a portion of a center conductor portion of a coaxial cable extender and a second insulator portion that is structurally configured to receive at least a portion of the first insulator portion. The second insulator portion may comprise a higher dielectric constant than a dielectric constant of the first insulator portion such that the insulator may be structurally configured to enhance electrical performance of the coaxial cable extender.

The invention relates to a silicone rubber composition having specific dielectric properties which can be used as insulator material in high voltage direct current applications and a method for the manufacture of cable accessories like cable joints. The invention comprises as well a method for the determination of the optimum dielectric properties and the related amount of dielectric active additives.

Nonlinear composite compositions comprise a dielectric matrix material and flakes of a mixed metal oxide having the formula M1.sub.xM2.sub.yO.sub.z dispersed in the dielectric matrix material. M1 is selected from the group consisting of alkali metals, alkaline earth metals, and combinations thereof. M2 is a transition metal or post-transition metal, wherein M2 has an atomic number no greater than 78. The number x is in the range 0.3x1, y is a number in the range 0.5y1.5, and z is a number selected such that the mixed metal oxide is electrically neutral, wherein the amount of flakes in the nonlinear composite composition is sufficient that the nonlinear composite composition has a nonlinear increasing conductivity in response to increasing electric field. Methods of making nonlinear composite compositions and articles including them are disclosed.

Elastomer compositions with high dielectric constants are disclosed. Embodiments of the disclosure include a high dielectric constant (high-K) elastomeric composition comprising an elastomer, carbon black (CB), and organoclay (OC). The composition is not dependent on any raw material with inherent high-k or any metal oxide type material that changes conductivity with applied voltages. The composition instead uses distributed electric fields and polarizability with carbon black and organoclays. This allows for a high-k material through polarizability with limited large-scale electron sharing.

A composition for manufacturing a crosslinked ethylene tetrafluoroethylene (ETFE) copolymer with enhanced abrasion resistance and heat resistance is provided, the composition including ETFE, about 0.1-10% w/w of a metal oxide that effectively scavenges high levels of fluoride ions; and a crosslinking agent. Methods of using and making the composition are also provided.

Provided is a method for regulating a thermal boundary conductance between a metal and an insulator, including: arranging a metal on a surface of an insulator, a contact surface between the metal and the insulator being a boundary between the metal and the insulator; and the insulator including a ferroelectric, a piezoelectric, or a pyroelectric; applying an external electric field or stress to the ferroelectric, and adjusting a magnitude of the external electric field or stress, or an included angle between a direction of the external electric field or stress with the boundary to regulate the thermal boundary conductance; or applying a stress to the piezoelectric, and adjusting a magnitude of the stress, or an included angle between a direction of the stress with the boundary to regulate the thermal boundary conductancer; or adjusting a temperature of the pyroelectric to regulate the thermal boundary conductance.

Electrical field grading material which comprises a non-polar elastomeric polymer, a phyllosilicate filler and a carbon black filler, wherein any carbon black filler present in the electric field grading material has a dibutyl phthalate (DBP) absorption number from 30 to 80 ml/100 g. The above material may be used in electrical cable accessories, particularly electrical cable joints or terminations for medium or high voltage cable. The electrical field grading material according to the present invention has varioresistive properties, particularly a significant variation of electrical conductivity as a function of the applied voltage within a reduced voltage range, so as to guarantee a high value of conductivity above a critical value of the electrical field, and therefore to ensure an even distribution of the electrical field lines within the material.

In at least some implementations, a wire includes a core formed from an electrically conductive material and having an outer surface, and a polymeric insulator surrounding the core. The insulator has a resistivity of between 10.sup.5 and 10.sup.9 ohms/square, and the insulator has an inner surface engaged with the core. In at least some implementations, the core is formed from metal and has a conductivity of at least 1106 m. The insulator may include a base material and a conductive material in the base material, wherein the conductive material has a conductivity between 10.sup.5 and 10.sup.6 ohms/square. The insulator may have an outer surface that defines an outer surface of the wire and/or the insulator may have an inner surface engaged with the core.