Page 309 - Engineering Plastics Handbook

Polyamide-imide (PAI) 269

The final composite structures claim excellent chemical resistance,
high strength, moderate ductility, and toughness.

Engine components. Parts fabricated from injection-molded fiber-
reinforced polyamide-imides provide a lower-cost solution to previously
machined metal pieces and maintain, due to low shrinkage, very tight
tolerances which are required in these applications. Polyamide-imide
compounds have replaced expensive titanium in air return grills for
commercial aircraft engines (Fig. 12.13). The shroud on the interior of
the aircraft engine, responsible for directing airflow, consists of an assem-
bly of multiple polyamide-imide injection-molded pieces (Fig. 12.14).

Figure 12.14 Aircraft engine shroud.