Abstract: Track and erosion resistant electrical insulating materials are disclosed comprising (a) a base insulating material comprising a polymer of ethylene and additives necessary to allow the polymer to function as electrical insulation, and (b) hydrated zinc borate as an anti-tracking and anti-erosion additive. The hydrated zinc borate functions to increase the track and erosion resistance of the electrical insulating material in concentrations of as little as 1% by weight of the entire material with its maximum effect being achieved at concentrations of about 25% by weight of the entire material.

Abstract: This specification discloses a means for providing a barrier against the passage of fire through that portion of a wall aperture surrounding an electrical conduit, pipe, or the like. This is accomplished by placing a sleeve around that portion of the conduit passing through the wall, which sleeve is the central portion of an envelope which is anchored peripherally to the wall or to a more or less rigid material blocking the aperture through the wall and which sleeve connects to end portions of the envelope, each of which end portions extends to connect with the conduit on an opposite side of the wall. The annular region between the conduit and the surrounding envelope is filled with an intumescent gel. The boot is flexible and capable of some movement to compensate for thermal expansion, vibration or other forces during the life of the installation.

Abstract: A cable which is suitable for use as a riser cable in buildings comprises a plurality of conductors each of which is covered with a composite insulation. The composite insulation comprises an inner layer of an expanded polyethylene material and an outer layer of a polyvinyl chloride material with the percent expansion of the inner layer and the thickness of the outer layer being such as to optimize several cable parameters. The resultant cable is one which has excellent fire-retardant properties such as, for example, an unusually low fuel content. Advantageously, this same cable lends itself to color coding for inside wiring and is capable of having a relatively high pair count density. All these parameters are optimized within the framework of specific transmission requirements.

Abstract: A jacketed electrical cable construction has low smoke and flame spread characteristics so that it is suitable for use in plenum air spaces in buildings with drop ceilings without the need for metal conduits. The cable includes a bundle of conductors which are insulated with poly(vinylidene fluoride), a wrapping of poly(tetrafluoroethylene) impregnated glass tape surrounding the bundle of conductors and a jacket of poly(vinylidene fluoride).

Abstract: The invention concerns a novel cladded elongate substrate such as a jacketed cable, the cladding being flame retarded and comprising a vinyl acetate/alkene copolymer composition incorporating a halogen-free inorganic flame retardant. The composition is characterized by a high content of vinyl acetate and/or the presence of a polyalkene or alkene/alkene copolymer blended with the vinyl acetate/alkene copolymer.

Abstract: A method of making a cable (20) specially suited for use in building plenums because of its low flame spread and smoke evolution includes enclosing a multiconductor core (22) in a sheath comprising an inorganic, cellular core wrap (31), a corrugated metallic barrier (40) and dual layers (51) and (52) of a polyimide tape. The tapes are wrapped helically about the barrier in a manner that avoids a compression of the core wrap. The sheath is effective to resist heat transfer inwardly toward the core by conduction while the metallic barrier reflects radiant heat. Advantageously, the sheath containerizes the core without unduly compressing it and thereby allows the intumescence of conductor insulation during a fire to form char which is effective to suppress the evolution of smoke and the propagation of flame.

Abstract: A spacer is coiled about a drawn, seamless copper tube, and a metal foil or metallized paper ribbon is folded around the coiled spacer. A blend for foaming is injected into the unoccupied space between the folded foil or ribbon and the inner tube, to generate a cyanurate-modified polyurethane foam network in which phosphorous or halogen molecules are embedded by chemical bond. A flame-resistant ribbon is folded about the metal tube. The resulting product and further details of the process are described.

Abstract: An insulated cable has a hermetically enclosed sheath. Between the sheath and the insulation of the cable is a filler of a thermoplastic material. When the cable is heated (e.g. a localized fire) gases and acids that are given off by the insulation are absorbed by the filler which also expands resulting in a structural blockage to the longitudinal flow of the acids and gases.

Abstract: A cable (20) specially suited for use in building plenums because of its low flame spread and smoke evolution includes a multiconductor core (22) which is enclosed in a sheath comprising an inorganic, cellular core wrap (31), a corrugated metallic barrier (40) and dual layers (51) and (52) of a polyimide tape which are wrapped helically about the barrier in a manner that avoids a compression of the core wrap. The sheath is effective to resist heat transfer inwardly toward the core by conduction while the metallic barrier reflects radiant heat. Advantageously, the sheath containerizes the core without unduly compressing it and thereby allows the intumescence of conductor insulation during a fire to form char which is effective to suppress the evolution of smoke and the propagation of flame.

Abstract: A radiating cable communication system for a transportation undertaking is given useful fire-survival characteristics by incorporating on the surface of the cable dielectric, inside the outer conductor and so in the electric field, of the mica paper tape. This is much more effective than, for instance, using flame-retardant grades of polyethylene for the dielectric and flame-retardant grades of PVC for the sheath and, surprisingly, it has less effect on the electrical transmission characteristics of the cable.

Abstract: A fire protective tape using a halogen-free mastic coating on a fabric support is provided, the essential components of the mastic being solids including a low fusing ceramic frit, hydrated solids having chemically bonded water which is released as a fire protective water vapor when heated, solids which expand or intumesce during the same heat application to form a porous, expanded or foamy insulating body, solids which have a fire break effect, such as antimony oxide and zinc tetraborate, and binder solids which are thermoplastic resins and serve to bind the solids into a flexible coating when applied, the binder solids being dispersed as an emulsion in water and mixed with the other solids to form a mastic. With further addition of water the mastic is converted to a selected viscosity for application by troweling, coating or spraying.

Abstract: A fire protective mastic is provided, whose essential components are solids including a low fusing ceramic frit, hydrated solids having chemically bonded water which is released as a fire protective water vapor when heated, solids which expand or intumesce during the same heat application to form a porous, expanded or foamy insulating body, solids which have a fire break effect, such as antimony oxide and zinc tetraborate, and binder solids which are thermoplastic resins and serve to bind the solids into a flexible coating when applied, the binder solids being dispersed as an emulsion in water and mixed with the other solids to form a mastic. With further addition of water it is converted to a selected viscosity for application by troweling, coating or spraying.

Abstract: A hose construction and method of making same are provided wherein such hose construction is made primarily of combustible polymeric material and has a tubular inside surface defining a longitudinally extending passage for conveying a fluid therethrough and has an outside surface; and, the hose construction has at least one member which has a fire extinguishing material comprising same disposed adjacent one of the surfaces with the fire extinguishing material being activated upon subjecting the member to combustion temperatures.

Abstract: This inside wiring cable has insulated conductors surrounded by one or more layers of heat-resistant tape covered by a protective metal sheath which is preferably made of longitudinally folded metal strip with the seam welded and the tube metal then reduced in diameter down into intimate contact with the core and annealed. The cable is fire-resistant so that it does not spread fire. The metal sheath prevents any "afterburn.

Abstract: An insulated, multi-conductor electrical cable having a low halogen content and a high degree of resistance to flame and combustion.

Abstract: A cable structure for telecommunication or power supply applications, comprising one or more conductors, each of which is surrounded by a micatape embraced by an insulating layer of heat resistant rubber. The conductors are embraced by a thermoplastic elastomer on the outside of which there is placed a braided metal armour. The structure has an outer sheathing of chlorine sulphonated polyethylene or ethylene propylene rubber. Used as a three-conductor power cable the conductors are twisted together inside the layer of thermoplastic elastomer.

Abstract: An insulated electrical conductor comprising a core carrying an inner coating of heat resistant material and a uniform outer coating of fused polymeric material forming a smooth pin-hole free surface.

Abstract: A method of producing an insulated electrical conductor, in which a wire conductor is coated with an inner layer of heat resistant material and covered with electrostatically deposited powdered polymeric material which is fused by heat to form an outer layer of insulation. An insulated electrical conductor produced by this method comprises a core carrying an inner coating of heat resistant material and an outer coating of fused polymeric material.

Abstract: Electrical wire and cable suitable for use in nuclear generating stations, having at least one electrical conductor, a micaceous insulating layer surrounding the conductor and a layer of fluoropolymer insulation surrounding the micaceous layer.

Abstract: A fire protective insulating product which, when placed about electrical cables, cable trays or conduits, is capable of protecting the cable or pipe from exposure to open flame temperatures of 1600.degree. to 2000.degree. F. The product comprises a first layer containing insulative, inorganic non-combustible fibers, and a coating thereon comprising 1.5 to 20% organically bound halogen, 3 to 75% high temperature resistant non-combustible fiber, and 5 to 75% resinous binder.

Abstract: A radiation resistant cable is made by wrapping a barrier film over a conductor and covering it with a silicone saturated asbestos covering. The asbestos is passed through one or more dies to compact the asbestos covering and accurately size it. One or more layers of polyimide tape is wrapped about the asbestos. The polyimide tape is covered by a heat-sealable tape over which a fiberglass cover is braided. The cable is then heated to seal the heat-sealable tape to itself as well as to the adjacent layers. The cable is then passed through a coating bath to impregnate and saturate the fiberglass braid, following which the cable is heated to extract the solvent in the coating solution.

Abstract: Electric arc and flame protective sheath or boot material for electrical, particularly for high voltage electrical, cables and complex electrical splices, junctures and the like, is precast preferably from a liquid polyvinyl chloride plastisol, preformed into a selected shape of a protective sheath or boot, reinforced and protected against destruction by pre-mixing with a filler of heat resistant fiber containing flame and fire-retardant plasticizer as well as fire-retardant, preferably intumescent, and heat stabilizing substances. The precast sheath or boot is flexible and elastomeric and may be sized and shaped to be slipped upon the cable or joint protectively to further insulate and protect it against electrical arcing, heat or fire.

Abstract: Electric arc and flame protective tape for electrical, particularly for high voltage electrical cables and complex electrical, splices, junctures and the like, comprises a base sheet fabric coated with a thermoplastic resin preferably from a liquid polyvinyl chloride plastisol, reinforced and protected against destruction by pre-melting with a filler of heat resistant fiber, and containing flame and fire-retardant plasticizer as well as fire-retardant, preferably intumescent, and heat stabilizing substances. The tape is flexible and elastomeric and may be wrapped about the cable or joint, protectively to further insulate and protect it against electrical arcing, heat or fire.

Abstract: A polymeric composition having a polymer content which tends to evolve deleterious acid compounds upon being subjected to elevated temperatues; the composition including selected particle matter which is present in an amount to combine with or otherwise neutralize essentially the entire evolved deleterious compound when the composition is subjected to elevated temperatures; the composition with or without plasticizers being useful as insulation or jacketings for electric wire and cable, as well as diverse molded or extruded products, including disposable items such as packaging or the like.

Abstract: A telephone service cable which runs from a distribution cable to a subscriber's premises or to a pay station is another link in a buried communications system having a water-resisting capability. A spirally quaded core comprised of individually insulated conductors is advanced through a bath of a flame-retardant, water-resistant composition prior to enclosing the core with a jacket. The interstices in the core and between the core and an inner jacket are caused to be filled with the composition which comprises a liquid system and a solid system. The liquid system includes a chlorinated paraffin while the solid system includes a polyvinyl chloride resin and a chlorinated polyethylene. An epoxy stabilizer and a phosphite stabilizer may be added to prevent thermal degradation of the filling composition.

Abstract: A fire protective tape using a halogen-free mastic coating on a fabric support is provided, the essential components of the mastic being solids including a low fusing ceramic frit, hydrated solids having chemically bonded water which is released as a fire protective water vapor when heated, solids which expand or intumesce during the same heat application to form a porous, expanded or foamy insulating body, solids which have a fire break effect, such as antimony oxide and zinc tetraborate, and binder solids which are thermoplastic resins and serve to bind the solids into a flexible coating when applied, the binder solids being dispersed as an emulsion in water and mixed with the other solids to form a mastic. With further addition of water the mastic is converted to a selected viscosity for application by troweling, coatingor spraying.