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Jacketing Insulations:
JACKETS - Applied over primary insulation,
shields, cable components or over the cable itself, Includes
many of the primary insulating materials, containing nylon,
neoprene, hypalon, ethylene-propylene rubber, polyurethane,
etc. Jackets cover and protect the enclosed wires or core against
damage, chemical attack, fire and other harmful elements which
may be present in the operating environment.
Common Jacket Types:
PVC is a thermoplastic inherently flame
and abrasion resistant material that is specially compounded
for general-purpose applications at temperatures to 105°C.
TPE is thermoplastic elastomer or TPR.
Thermoplastic rubber has mechanical characteristics of thermoset
rubbers yet is a thermoplastic. They have excellent ozone and
chemical resistance, excellent electrical properties and low
water absorption. Temperature range is -70°C to 125°C.
Polyurethane has exceptional resistance to
oil, radiation, fungus, oxidation and ozone. It is unusually
tough, has higher tensile strength and elongation, more abrasion
resistance and better low temperature flexibility than neoprene.
Its major disadvantage is poor resistance to steam, high temperatures
and acids. But it has outstanding "memory" properties,
making it an ideal jacket material for retractile cords. Since
it is an expensive material, it is only specified when other
jacket materials will not satisfy the requirements of the application.
Low Density Polyethylene (LDPE) is a very
good insulation in terms of electrical properties. Low dielectric
constant, a stable dielectric constant over all frequencies
and a veryh igh insulation resistance. LDPE is fairly flexible.
Moisture resistance is excellent, but LDPE is flammable. |
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