POM (Polyoxymethylene, Polyoxymethylene), also known as Cysteel or DuPont Trane, is an engineering plastic with excellent mechanical properties. It is a highly crystalline thermoplastic that is widely used for precision parts and mechanical parts in high load environments due to its high rigidity, strength and wear resistance.

Main properties of POM:
1. high strength and rigidity: the mechanical properties of POM are close to those of metal, with good impact resistance and creep resistance.
2. low coefficient of friction and wear resistance: POM excels in friction and sliding parts, and is suitable for use as a self-lubricating material.
3. chemical resistance: POM has good resistance to a variety of chemicals (such as solvents, alkalis), but is not resistant to strong acids.
4. Dimensional stability: Due to its low water absorption, POM remains dimensionally stable in humid environments.
5. Good processability: POM can be processed by injection moulding, extrusion and blow moulding, which is suitable for mass production.

Application of POM:
Due to its high strength and abrasion resistance, POM is widely used in the manufacture of precision parts, especially those that require long time performance retention. Typical applications include:
- Gears, bearings, cams, pulleys and other mechanical transmission parts
- Automotive parts: e.g. door handles, oil pump parts
- Electrical and electronic appliances: e.g. connectors, switch parts
- Household appliances: e.g. zips, slides, internal parts of clocks and watches.
- Medical devices: such as syringe parts

Classification of POM:
POM can be divided into two categories:
1. homopolymer POM: polymerisation of a single formaldehyde monomer, higher strength, hardness, but heat resistance is slightly worse.
2. copolymer POM: polymerisation of formaldehyde with other copolymer monomers, with better heat resistance and chemical stability, but with slightly lower relative strength and hardness.
POM limitations:
- Not resistant to strong acids: it will be corroded when in contact with strong acids.
- Poor UV resistance: Exposed to UV light, POM ages easily.
- Flammability: POM is a flammable material and burns easily, so it has limited application in some environments with high fire resistance requirements.

Overall, POM is an engineering plastic with excellent performance for high load and long life application scenarios.

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