PI Guide | Machining Design Considerations | Penta Precision

sales@pentaprecision.co.uk       +44 (0) 2392 668 334

PI / Polyimide Machined Parts

A Guide to PI - CNC Milled & Turned Parts: Properties, Applications and Design Considerations

What is PI?

Polyimides (PI or often referred to as the brand name Vespel®) are a family of some of the most heat and fire resistant polymers in existence. Low wear rates combined with the ability to work under unlubricated conditions and high pV-rates makes it the ideal material for challenging friction and wear applications, extending lifetime and reducing maintenance costs. 

There are many different grades of PI/Polyimide, all with varying characteristics. A comparison of the technical properties can be found in the tab below.

Main Attributes of PI:

  • High strength
  • Outstanding wear resistance
  • High dimensional stability, even up to 260°C
  • Long term thermal stability 300°C
  • Excellent thermal and electrical insulation
  • Good machinability
  • Flame retardant
  • Creep resistant
  • Good chemical resistance
  • Resistance to high energy radiation
  • Excellent machinability

GET A QUOTE

Simply complete our short form to receive your quotation.

Detailed information about PI 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 PI referred to as:

PI Components, Applications & Industries

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

Typical Components & Applications:
  • Valve and pump seats
  • Wear parts
  • Fixtures
  • Washers, bushings, bearings
Industry Examples:
  • Aerospace
  • Nuclear
  • Automotive
  • Military / Defence
  • Mechanical engineering
  • Electrical / Electronics
  • Food technology
  • Vacuum technology

    PI Machining Service

    Penta Precision provides highly accurate machined parts in PI. 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 PI 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?

    We are committed to delivering an exemplary service to our customers. One significant way in which we achieve this is through
    the implementation of our ‘3 Cs’:

    • 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 PI 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. Contact us to discuss how we can help you with your PI machining requirements. 

    Can we meet your
    PI 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

    Tel: +44 (0) 2392 668 334

    Fax: +44 (0) 2392 668 335

    Connect with us:

    Penta Precision Engineering Ltd

    Aspen House

    Airport Service Road

    Portsmouth

    Hampshire

    PO3 5RA

    subfooter map