Polyformaldehyde (POM), commonly known as Acetal Resin, is called "metal plastic" and belongs to engineering plastics. It has a regular molecular structure and is divided into homopolymer and copolymer types. Featuring high rigidity and hardness, low friction coefficient, excellent wear resistance and dimensional stability, it can replace non-ferrous metals such as copper and aluminum, and is widely used in electronic and electrical appliances, auto parts, mechanical parts, daily consumer goods and other fields.