Polyoxymethylene (POM), also known as Acetal, is an engineering thermoplastic produced through the polymerization of formaldehyde or its derivative, trioxane. In the case of homopolymer POM, formaldehyde is generated by oxidizing methanol, then polymerized using anionic catalysts after purification through cold traps. For copolymer POM, trioxane is synthesized and copolymerized with small amounts of comonomers like ethylene oxide, enhancing thermal and chemical stability. The result is a high-strength, low-friction polymer with excellent dimensional stability, widely used as a metal replacement in precision components across automotive, industrial, and electronic applications.