Polyformaldehyde (POM), also known as acetal resin, polyoxymethylene, polyacetal, is a thermoplastic crystalline polymer, known as "super steel" or "steel".

After polyamide, another engineering plastic with excellent comprehensive performance, it has high mechanical properties, such as strength, modulus, wear resistance, toughness, fatigue resistance and creep resistance, as well as excellent electrical insulation, solvent resistance and machinability. It is one of the five general engineering plastics.

Polyformaldehyde (POM) is a kind of engineering plastics with excellent properties, which is known as "taking steel" and "super steel" in foreign countries. POM has similar hardness, strength and rigidity to metal. It has good self-lubrication, good fatigue resistance, and elasticity over a wide range of temperature and humidity. In addition, it has good chemical resistance. At a lower cost than many other engineering plastics, POM is replacing some markets traditionally occupied by metals, such as replacing zinc, brass, aluminum and steel to make many parts. Since its introduction, POM has been widely used in electronic and electrical, machinery, instrument, daily light industry, automobile, building materials, agriculture and other fields. In many new fields of application, such as medical technology, sports equipment and so on, POM also shows a good growth trend.