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Perth CNC Machining

Perth Acetal Machining

What is Acetal?

Acetal is a semi-crystalline thermoplastic, which we recommend for precise and robust parts.

The material is an engineering plastic that is highly machinable, tough wearing, and useful for various purposes. 


Acetal is also known as polyoxymethylene (POM) and has two main types. These include acetal copolymer (POM-C) and acetal homopolymer (POM-H). 


Acetal can be sourced in rod, tube, and sheet form, and is machinable to customer specifications.


To speak to one of our Perth engineers, contact us by phone, email, or our contact form. Continue reading to learn more about acetal.

Acetal Properties

Acetal Advantages and Disadvantages

Acetal is generally resistant to chemical manipulation from hydrocarbons, solvents and neutral chemicals.


Acetal's main advantages are:

  • Tensile strength, rigidity, and hardness

  • Lack of water absorption

  • Low friction

  • Resistance to thermal expansion

  • Resistance to creep

  • Resistance to impacts

  • Good dimensional stability

  • Excellent machinability


Additionally, the two types of acetal have their own respective properties:


  • Acetal polyoxymethylene (POM) is resistant to alkalis, water degradation, and high-heat environments.


  • Acetal homopolymer (POM-H) is stronger, stiffer, and tougher at room temperature.


One potential disadvantage of acetal is that it is chemically resistant. Therefore, it does not bond well and is not recommended for prototyping. Additionally, UV exposure will cause acetal to become brittle.

What is Acetal Used For?

Acetal Examples and Applications

Acetal's advantageous properties make it perfect for a variety of applications. 

Common acetal applications include:

  • Sliding mechanisms and gears

  • Food grade uses cases

  • Bearings

  • Valve seats

  • Cams 

  • Parts in hot water (60°C to 80°C)

  • Insulating electrical components

acetal part
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