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. Produced by various chemical firms, it is commonly known by names such as Delrin, Kocetal, Ultraform, Celcon, Ramtal, Duracon, Kepital, Polypenco, Tenac, and Hostaform.

POM (Acetal): Characterized by high strength, hardness, and rigidity down to −40 °C. It is intrinsically opaque white with a density of 1.410-1.420 g/cm3.

Polypropylene (PP): A thermoplastic polymer used in wide applications. It is hard, heat-resistant, and offers high chemical resistance.

Nylon 6 (PA6): A semicrystalline polyamide formed by ring-opening polymerization, offering unique mechanical properties compared to other nylons.