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POM is an acronym for the chemical name polyoxymethylene. It is generally referred to as polyacetal or acetal resin. It is a crystalline thermoplastic resin comprised chiefly of (-CH2O-) structural units.

The two types of POM are homopolymer, which is comprised of a polyoxymethylene molecular chain made from formaldehyde bonds, and copolymer, in which trioxane, the trimer of formaldehyde, and other comonomers are bonded.

DURACON is a representative type of copolymer, and it plays an active role in applications centered on mechanical components such as gears, screws, and bearings.

Examples of its use can be found in AV equipment such as DVD recorders, blu-ray disk recorders, OA equipment such as printers, copying machines, household appliances such as washing machines, refrigerators and electrical shavers, and automobile parts such as fuel caps, pump modules, seat belt mechanical components and interior parts, as well as household equipments such as window sashes and blind parts, toys such as latest game machines.


[ Homopolymer and copolymer ]

As mentioned previously, POM can be either a homopolymer or a copolymer. The homopolymer is formed solely from carbon-oxygen bonds in the main chain, while the copolymer also includes carbon-carbon bonds in the main chain.

Homopolymer structureCopolymer structure

The properties and functions of homopolymers and copolymers differ on account of the differences in molecular structure.


1. The thermal stability of the copolymer is superior to that of the homopolymer.

1) Accordingly, color changes and gas emissions during molding are lower because degradation is smaller, and a wider temperature window can be adopted for molding.

2) Resistance to hot water, alkalis and oils at elevated temperatures is excellent.


2. The chemical structure of the copolymer results in a slightly lower crystallization rate compared with the homopolymer.

1) Accordingly, while strength and stiffness are somewhat lower, flexibility is excellent.

2) In addition, while the melting point and heat deflection temperature are approximately 10 deg C lower, there is no difference in the practical heat resistance temperature.


  Driving gears for laser printers Cosmetic containers Mechanical components for DVD-ROM drives
  Driving gears for laser printers Cosmetic containers Mechanical components for DVD-ROM drives



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