Page 68 - Chemical and process design handbook

Speight_Part II_A 11/7/01 3:16 PM Page 2.9

ACETAL RESINS 2.9
Acetal resins are generally stable in mildly alkaline environments.
However, bases can catalyze hydrolysis of ester end groups, resulting in a
less thermally stable polymer.
Acetals provide excellent resistance to most organic compounds except
when exposed for long periods at elevated temperatures. The resins have
limited resistance to strong acids and oxidizing agents. The copolymers
and some of the homopolymers are resistant to the action of weak bases.
Normally, where resistance to burning, weathering, and radiation are
required, acetals are not specified. The resins are used for cams, gears,
bearings, springs, sprockets, and other mechanical parts, as well as for
electrical parts, housings, and hardware.