Polyoxymethylene (
POM), also known as
acetal,
polyacetal and
polyformaldehyde, is an engineering
thermoplastic used in precision parts requiring high stiffness, low friction and excellent dimensional stability. As with many other synthetic
polymers, it is produced by different chemical firms with slightly different formulas and sold variously by such names as
Delrin,
Celcon,
Ramtal,
Duracon,
Kepital and
Hostaform.