Page 267 - Engineering Plastics Handbook

Thermoplastic Polyimide (TPI) 229

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reciprocating compressors, the close tolerance moldability of Aurum is
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another critical feature. Aurum gears can be insert-molded around a
metal hub and have a safe working stress of 4500 psi at 392°F (200°C).
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In addition, Aurum pump components are widely used. Gears, bearings,
seals, and housings take advantage of the exceptional chemical resist-
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ance of Aurum at elevated temperatures.
Business machinery is another industrial application. Aurum has the
ability to operate efficiently at elevated temperatures in dry and inter-
mittent-lubrication environments, which has led to an extensive list of busi-
ness machinery applications. In high-speed digital copiers and printers,
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Aurum thermal insulators, paper stripper fingers, end caps (called gud-
geon), gears, and drive couplings operate at temperatures to 480°F (249°C).
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Specially formulated, low-wear Aurum compounds are available that
function exceptionally well against counter surfaces including steel, alu-
minum, and rubber.

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Wire, cable, film, and fiber. Aurum can be extruded into wire, cable, film,
and fiber (Fig. 10.6). The extruded wire and cable are for electrical insu-
lation with outstanding thermal, mechanical, chemical, and electrical
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properties. Aurum film is available in 1- to 22-mil-thick rolls from
Westlake Plastics. The applications include wire, cable, and optic fiber insu-
lation; industrial belts; heat and radiation panels; and other electric and
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thermal insulation devices. Aurum monofilament and multifilament can
be woven and braided into a variety of high-performance industrial and air-
craft products including paper-making belts and jet-engine insulation.

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Aircraft and aerospace. Aurum components are increasingly specified
in the aerospace industry as metal and ceramic replacements where

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Figure 10.6 Aurum fiber.