PTFE (Teflon) Plastic Machining

Your guide to PTFE Plastic Machining



Excellent chemical resistance

Semi-crystalline fluropolymer thermoplastic

Widely used fluropolymer in a range of applications

PTFE (Polytetrafluoroethylene) is a semi-crystalline fluropolymer thermoplastic. It is commonly referred to as Teflon which is a brand name. There can be some challenges to machining PTFE due to its high coefficient of expansion, and its conductivity. A skilled and experienced CNC machining partner is imperative.

This guide will take you through the main attributes, common applications, notes for designers and suitable finishing and treatments, as well as UK stock sizes and property tables. Don't forget to bookmark the page so you can refer back later.

If you are interested in PTFE machined parts, please scroll to the bottom of the page for more information about our service and to request a quote.

PTFE Guide: Properties, Applications and Design Considerations


What is PTFE plastic?
PTFE (Polytetrafluoroethylene) is a semi-crystalline fluropolymer thermoplastic. It is commonly referred to as Teflon which is a brand name.

PTFE is the most widely used fluropolymer in a range of applications. It is known for being highly resistant to chemicals and for its superior thermal stability.

Compared to other engineering grade thermoplastics it has poor mechanical properties, though glass and carbon filled grades with improved dimensional stability are available.

Because of its resistance to chemicals, PTFE plastic is commonly used in chemical, food and pharmaceutical engineering.

PTFE is favoured over PVDF for sliding applications with exposure to extreme chemical stress.

Machining of PTFE must take conductivity and expansion effects into account. When machining PTFE, we ensure we use very sharp tools and plenty of coolant to avoid any stability issues.

You may also see PTFE referred to as:

  • Teflon®

Industry Examples: Chemical & petrochemical | Food processing | Pharmaceutical | Medical | Scientific | Aerospace


Typical Components & Applications: Valves | Pump components | Fittings | Bearings | Seals | Insulators | Manifolds | Bushings | Semiconductor components | Gears | Capacitors | Gaskets | Assemblies

Main Attributes:
  • Excellent chemical resistance
  • Good electrical insulating properties
  • Wide working temperature from -260°C to 260°C
  • Poor mechanical properties – glass and carbon filled modifications available to improve dimensional stability
  • Low flammability
  • High UV and weather resistance
  • Suitable for food contact
  • Water resistant
  • High impact strength
  • Very low coefficient of friction
  • No moisture absorption

Note For Designers:

Due to its high coefficient of expansion, PTFE is usually machined to tolerances of around 0.13mm.

Tighter tolerances are rarely required due to the natural resiliency of the material. Where tighter tolerances are required, it is advised to use stress-relieved PTFE.

Can we meet your PTFE plastic machining needs? Contact us now
Get a Quote


PTFE Plastic Machined Parts


Penta Precision provides the following plastic PTFE / Teflon machining services: 
  • CNC milling
  • CNC turning
  • Prototypes and batch runs
  • Insert installation
  • Part marking
  • Manual milling
  • Manual turning
  • Machining design advice
  • Design for manufacture service

Want to know more?


Find out how we can help you


Plastic Machining


Plastic Machining


Industry Sectors


Industry Sectors


Commitment To Quality


Commitment to Quality

Get A Quote