Cable jacket

Nitrile mbber finds broad application in industry because of its excellent resistance to oil and chemicals, its good flexibility at low temperatures, high abrasion and heat resistance (up to 120°C), and good mechanical properties. Nitrile mbber consists of butadiene—acrylonitrile copolymers with an acrylonitrile content ranging from 15 to 45% (see Elastomers, SYNTHETIC, NITRILE RUBBER). In addition to the traditional applications of nitrile mbber for hoses, gaskets, seals, and oil well equipment, new applications have emerged with the development of nitrile mbber blends with poly(vinyl chloride) (PVC). These blends combine the chemical resistance and low temperature flexibility characteristics of nitrile mbber with the stability and ozone resistance of PVC. This has greatly expanded the use of nitrile mbber in outdoor applications for hoses, belts, and cable jackets, where ozone resistance is necessary. 

For primary insulation or cable jackets, high production rates are achieved by extmding a tube of resin with a larger internal diameter than the base wke and a thicker wall than the final insulation. The tube is then drawn down to the desked size. An operating temperature of 315—400°C is preferred, depending on holdup time. The surface roughness caused by melt fracture determines the upper limit of production rates under specific extmsion conditions (76). Corrosion-resistant metals should be used for all parts of the extmsion equipment that come in contact with the molten polymer (77). 

Phosphazene polymers are inherently good electrical insulators unless side-group stmctures allow ionic conduction in the presence of salts. This insulating property forms the basis for appHcations as wire and cable jackets and coatings. Polyphosphazenes also exhibit excellent visible and uv radiation transparency when chromophoric substituents are absent. 

The favorable balance of properties of ethylene—acryflc elastomers has gained commercial acceptance for these elastomers in a number of demanding applications, especially in the automotive industry and in wire and cable jacketing. 

Leyden and Rabb [68] have illustrated the rubber formula reconstruction process. Table 2.8 shows some of the difficulties encountered in the reconstruction of a complex wire and cable jacket compound. Forrest [38] has illustrated the reverse engineering of the reasonably complex highly flame retardant elastomer compound of... 

Examples A, closed cell thermal insulation with high fire retardency and low smoke generation (52,54) B, pigmented APN coatings in aluminum substrates with low flammability, low flame spread, and low smoke (55) C, APN insulation and cable jacketing (56) D, open cell APN comfort cushioning (57). (Photograph courtesy of the Firestone Tire... 

Due to its balance of strength, oil resistance, inflammability, increased resistance to ozone, ageing and weathering, polychloroprene finds widespread industrial use. Typical uses are V-belts, conveyor belts, wire and cable jacketing, footwear, wet suit applications, coated fabrics, inflatables, hoses, extrusions and many other goods. Adhesives are also a strong market area. 

This material finds use as a sealing material in automotive applications and marine motor lead wire insulation. It has also been used as the base polymer for low flammability, halogen free, cable jacketing compounds. 

Polyurethane elastomers are exceptionally tough, abrasion resistant, and resist attack by oil. The polyester types (AU) are susceptible to hydrolytic attack at above ambient temperatures, and certain polyester thermoplastic polyurethanes have been known to stress crack in cable jacketing applications when in contact with water at ambient temperatures this latter effect has sometimes, incorrectly, been ascribed to fungal attack. Polyether types (EU) are far more resistant to hydrolytic attack. Certain polyurethanes can be attacked by UV light, the resistance to this agency primarily being determined by the isocyanate used. 

Polyurethanes are used in a wide variety of applications, seals, metal forming dies, liners, coupling elements, rollers, wheels and conveyor belts being examples. The thermoplastic polyurethanes are used as cable jacketing materials, conduits, fabric coatings, in ski boots and other rigid boot soles, automotive body components, gear wheels and other business machine parts. 

The electrical properties of the polyurethanes are not adequate for use as primary insulations, but their general toughness leads to their use as cable jacketing materials. 

Cable jackets, conduits, fabric coatings, ski boots and other boot soles. 

Cable jackets, hose jackets, tubing, seals, automotive bellows, mechanical parts, gear wheels, business machine parts. 

Wire and cable jacketing (halogen-free flame retardant HFFR)... 

Wire and cable jacketing, electrical and communication cable jacketing, coil cables... 

PEBA is used in cable jacketing and aeronautics for its heat behaviour and good resistance versus certain chemicals. 

SES and SEES are insulating and are used for low-tension wire and cable jacketing. Special grades are antistatic or conductive. 

This new rubber was given the name Neoprene (Equation 9.38). Neoprene had outstanding resistance to gasoline, ozone, and oil in contrast to NR. Today, neoprene is used in a variety of applications including as electrical cable jacketing, window gaskets, shoe soles, industrial hose, and heavy duty drive belts. 

Estane". Trademark of B.F. Goodrich Chemical Co, Cleveland,Ohio for a thermoplastic, polyurethane material, suitable for wire and cable jacketing, fuel hose and tanks, belting etc... 

N660 high modulus, high hardness, low die swell, smooth extrusion carcass, sidewall, bead compounds, innediners, seals, cable jackets, hose, soling, EPDM compounds... 

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