General Description : Amorphous, strongly coloured, high performance polymers with linear predominantly aromatic molecules of high thermal stability. They are normally melt-processed but, after post-curing, are infusible in their fully finished form. If semi-fabricated items are machined, further post-curing is recommended if maximum properties are to be achieved. They have very good high temperature properties (approaching those of polyimides), good wear and radiation resistance, inherently low flammability and smoke emission and the highest strength of any unreinforced thermoplastic, but are very expensive and attacked by alkalis.

Applications include parts for internal combustion and jet engines, bearings and thrust washers and mechanical, electrical and electronic components.