Acetal Machining | Acetal Machined Parts | Penta Precision       +44 (0) 2392 668 334

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Acetal Machining

A Guide to Acetal CNC Machined Parts: Properties, Applications and Design Considerations

What is Acetal?

Acetal or POM (Polyoxymethylene) is an engineering plastic known for being amongst the strongest and stiffest of all thermoplastics.

There are two general types of Acetal resins available: Acetal Homopolymer and Acetal Copolymer.

Acetal homopolymer resins are made by the DuPont Company under the trade name Delrin®. Homopolymers are typically used in highly regulated industries.

Acetal copolymers are made by several companies. Slightly softer than Acetal homopolymers, the Acetal copolymers have a lower coefficient of friction.

Main Attributes of Acetal:

The two Acetal polymers do share many similar characteristics, however there are some significant differences which will determine which is most suitable for your application.

Acetal Copolymer: 
  • Absorbs very little moisture
  • High mechanical strength and rigidity
  • Improved dimensional stability over comparable homopolymer formulations due to the lower level of crystallinity
  • Low coefficient of friction
  • Good compressive strength
  • Good shock resistance
  • Better chemical resistance with high pH solutions
  • Lower centerline porosity than homopolymer in extruded shapes
  • Excellent machinability


Need parts machined by an experienced and reliable components manufacturer? Simply complete our short form to receive your no obligation quotation.

Acetal Homopolyer:

Detailed information about Acetal for designers including UK stock sizes and technical properties can be found in the tabs below. Please note: this information is provided as a guide only. All information is based on our present knowledge and is given in good faith. No liability will be accepted by Penta Precision in respect of any action taken by any third party in reliance thereon.

Similar or obsolete designation and trade names

You may also see Acetal referred to as:

Acetal Components, Applications & Industries

Here are some examples of the industries and components for which Acetal is appropriate. This is by no means an exhaustive list. Please do get in touch if you are considering using Acetal and we can talk through your project with you.

Typical Components & Applications:
  • Electrical insulation
  • Medical applications
  • Food contact components (FDA compliant)
  • Gears
  • Bearings
  • Housings
  • Fasteners
  • Bushings
  • Handles
  • Seals
  • Valves
  • Tooling
Industry Examples:
  • Food & packaging
  • Medical & pharmaceutical
  • Automative
  • Electrical/Electronic
  • Agriculture

Typically used in highly regulated industries such as:

  • Aerospace
  • Nuclear
  • Pharmaceutical


    Black Acetal Machined Part - Scientific

    Black Acetal Machined Part - Scientific

    Black Acetal CNC Machined Part - Scientific

    Black Acetal CNC Machined Part - Electronics

    Acetal Machining Service - Acetal Milling & Turning

    Penta Precision provides highly accurate Acetal machined parts. Customers turn to us when they have had quality and delivery issues with their existing suppliers and need a reliable precision machining partner.

    Penta Precision provides the following Acetal machining services: 

    • CNC milling – prototypes & large batch runs
    • CNC turning – prototypes & large batch runs
    • Insert installation
    • Part marking
    • Manual milling
    • Manual turning
    • Machining design advice
    • Machining drawing service

    Reasons to Choose Penta:

    • ISO 9001:2015 quality assurance
    • Consistent high quality machined parts
    • Reliable delivery dates - our track record speaks volumes
    • Exceptional customer service and communication
    • Machining design advice
    • Extensive experience in our field
    What Makes Penta Different?

    There are 3 key elements that run through the core of our company and staff at every level to ensure we deliver an exemplary service that goes above and beyond. We like to call these our 3 C's:

    • We Communicate well 
    • We take Care at each stage
    • Our service is Consistent

    See our ‘Proven Process’ page to find out more

    We are regularly machining Acetal for customers all over the UK. Our customers depend on our machining expertise as well as our outstanding delivery performance, to machine the highest quality parts. If you'd like to discuss how we can help you with your Acetal machining requirements, here's a list of ways to get in touch with us.

    Want to know more about Penta?

    Can we meet your
    Acetal machining needs?
    Call our engineering team on
    +44 (0) 23 9266 8334
    or contact us via our email form

    "I'd just like to say my thanks for the quality level and prompt delivery of the prototypes and jigs that you produced for me during the start of the year. I would consider Penta the best subcontract company I've worked with whilst working here." Marc - Development Engineer