SAE International

Plastic: Polyimide For Molded Rod, Bar, and Tube, Plaque, and Formed Parts
 N AMS3644G

Annotation

Form

This specification covers a polyimide plastic in the form of isostatically molded rod, bar, and tube, unidirectionally molded plaque, and direct formed parts.

Application

These products are used typically for bushings, bearings, seals, and thermal-electrical insulators requiring a combination of toughness, low coefficient of friction, low wear, low creep, and good solvent resistance, but usage is not limited to such applications. Each application should be considered separately. Polyimide covered by this specification has a service temperature range of cryogenic to 500 °F (260 °C). These materials have no observable glass transition temperature (Tg) or melt temperature (Tm).

Classification

Product is classified on the amount of filler used with the base polyimide polymer as follows:

Class 1 Unfilled

Class 2 15% ± 3 by weight graphite

Class 3 37% ± 3 by weight graphite

Class 4 15% ± 3 by weight graphite plus 10% ± 3 by weight polytetrafluoroethylene (PTFE)

Class 5 15% ± 3 by weight molybdenum disulfide

and by the process used to produce the product as follows:

Form M Isostatically molded rod, bar, and tube

Form P Unidirectional molded plaque