Machining PET/Polyester | Machined PET/Polyester Parts | Penta Precision       +44 (0) 2392 668 334

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PET (Polyester) Machining

A Guide to PET/Polyester CNC Machined Parts: Properties, Applications and Design Considerations

What is PET?

Polyethylene terephthalate (PET) is a type of semi-aromatic Polyester. PET is a thermoplastic commonly known under the brand name Ertalyte®. It is a naturally colourless and semi-cristalline material.

The most widely used polyester, PET is readily available and relatively inexpensive.

It is a tough, dimensionally stable plastic that offers excellent wear resistance and mechanical strength. It is often reinforced with glass fibers or compounded with silicates or graphic in engineering applications to improve strength and rigidity.

Main Attributes of PET:

  • Relatively high density polyester
  • High strength
  • High hardness and rigity
  • Extremely high strength to weight ratio
  • Good creep resistance, even at elevated temperatures
  • Extremely low moisture absorption
  • Outstanding dimensional stability
  • Good temperature stability
  • Good dimensional stability
  • Good chemical resistance
  • Good adhesion and welding ability
  • Excellent wear resistance
  • Excellent stain resistance
  • Good electrical insulating properties
  • Good resistance to high energy radiation
  • Food (FDA) compliant
  • Very good heat and heat ageing resistance
  • Can be used at temperatures from -20 °C to +115 °C
  • Shatterproof
  • Recyclable


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

Detailed information about PET 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 PET referred to as:

PET / Polyester Components, Applications & Industries

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

Typical Components & Applications:
  • Base plates
  • Structural
  • Gears
  • Distribution valves
  • Friction strips
  • Dynamic seals
  • Bushes
  • Packaging machinery parts
  • Bearing
  • Rollers
  • Manifolds
  • Cases & covers
  • Switches
  • Insulation panes
  • Handles
  • Housings for appliances
  • Gears
Industry Examples:
  • Electronics
  • Medical
  • Automotive
  • Mechanical engineering
  • Food technology


    Glass Filled PET CNC Machined Prototype

    Glass Filled PET CNC Machined Prototype

    PET Machining Service - PET Milling & Turning

    Penta Precision provides highly accurate PET 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 PET 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 PET 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 PET machining requirements, here's a list of ways to get in touch with us.

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

    “Very professional service from quote to delivery ­ excellent quality.'' Steve - Managing Director 

    Tel: +44 (0) 2392 668 334

    Fax: +44 (0) 2392 668 335

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    Penta Precision Engineering Ltd

    Aspen House

    Airport Service Road



    PO3 5RA

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