POM (polyoxymethylene resin) definition: polyoxymethylene is a linear polymer with no side chain, high density and high crystallinity. According to the different chemical structures in its molecular chain, it can be divided into homoformaldehyde and copolyformaldehyde. The important differences between the two are: homoformaldehyde has high density, crystallinity and melting point, but poor thermal stability, narrow processing temperature range (about 10 ℃), and slightly low acid-base stability; The density, crystallinity, melting point and strength of CO formaldehyde are low, but it has good thermal stability, is not easy to decompose, has a wide processing temperature range (about 50 ℃), and has good acid-base stability. It is an engineering plastic with excellent comprehensive properties. It has good physical, mechanical and chemical properties, especially excellent friction resistance. Commonly known as saigang or seigang, it is the third largest general engineering plastic. It is suitable for making wear-resistant parts, transmission parts, chemical and instrument parts. One of the synthetic resins, also known as polyformaldehyde resin, POM plastic, saigang material, etc; It is a kind of white or black plastic particles with high hardness, high rigidity and high wear resistance. It is mainly used for gears, bearings, auto parts, machine tools, instrument internals and other products that play a skeleton role.