PEI Machining | PEI Machined Parts | Penta Precision       023 9266 8334

PEI Machining

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

What is PEI?

PEI (Polyetherimide) is a high performance amorphous thermoplastic which is typically transparent amber in colour.

PEI is commonly used for structural components requiring high strength and rigidity at elevated temperatures as well as broad chemical resistance.

Please see our PSU (Polysulfone) page for an alternative high performance thermoplastic which has similar characteristics but is cheaper and more readily available.

Main Attributes of PEI:

  • High mechanical strength
  • High rigidity
  • Very good dimensional stability
  • Relatively high long term service temperature
  • Flame resistant
  • Good chemical resistance
  • Excellent electrical properties
  • High strength to weight ratio
  • Glass-filled grade available
  • Low thermal conductivity
  • Highest dielectric strength of any thermoplastic
  • Transparent amber
  • High tensile strength
  • Semi transparent
  • Good UV resistance and weatherability
  • Most grades suitable for use with food
  • Can withstand dry heat sterilisation at 180°C, ethylene oxide gas and gamma radiation


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 PEI for designers can be found in the tabs below. Please note: this information is provided as a guide only.

PEI Machining Service - PEI Milling & Turning

Penta Precision supplies highly accurate PEI machined parts throughout the UK. 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 PEI machining services: 

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 high performance thermoplastics 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 PEI machining requirements, here's a list of ways to get in touch with us.

Want to know more about Penta?

Can we meet your
PEI machining needs?
Call our engineering team on
023 9266 8334
or contact us via our email form

"I have always found Penta to be very professional when dealing with them. I find good communication to be very important, something Penta excel at." Ben - Buyer

Tel: 023 9266 8334

Fax: 023 9266 8335

Connect with us:

Penta Precision Engineering Ltd

Aspen House

Airport Service Road




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