POM (English: polyformaldehyde) is a thermoplastic crystalline polymer, known as "super steel" or "race steel", also known as polyoxymethylene. The English abbreviation is POM. Usually, the polymer obtained by formaldehyde polymerization has a low degree of polymerization and is susceptible to thermal depolymerization. It can be used as raw material for organic chemicals and synthetic resins.

POM has high mechanical strength and rigidity, the highest fatigue strength, environmental resistance, good resistance to organic solvents, strong resistance to repeated impacts, a wide operating temperature range (-40℃~120℃), good electrical properties, and recovery properties Good, self-lubricating, good wear resistance and excellent dimensional stability. Customers in the prototyping industry are also interested in these characteristics of POM. For some projects with high mechanical strength and rigidity, they will choose POM as the material for prototyping.