Delrin / Polyoxymethylene
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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 and Hostaform. Typical applications for injection-molded POM include high performance engineering components such as small gear wheels, ski bindings, fasteners, knife handles, and lock systems. The material is widely used in the automotive and consumer electronics industry. The M-16 rifle’s stock and other parts are made of it.