This PEEK PTFE POM comparison helps engineers choose the right plastic for CNC machining. Specifically, three of the most requested engineering plastics at PlasticPartsCustom are PEEK, PTFE, and POM (Delrin). While each offers distinct advantages, there are also trade-offs. Therefore, here is a practical comparison to help engineers and buyers decide.

PEEK (Polyether Ether Ketone)

PEEK is the premium choice in any PEEK PTFE POM comparison. For example, it withstands continuous temperatures up to 260°C, resists almost all chemicals, and delivers tensile strength exceeding 90 MPa. As a result, medical device manufacturers choose PEEK for surgical instruments and implant components because it is biocompatible and can be sterilized repeatedly. Similarly, semiconductor equipment relies on PEEK for wafer handling parts that must not outgas or degrade in plasma environments. Learn more about PEEK material properties on Wikipedia. However, the downside is clear: PEEK costs 5-10x more than standard engineering plastics.

Best for: Medical instruments, semiconductor components, aerospace bushings, high-temperature seals.

PTFE (Polytetrafluoroethylene / Teflon)

In contrast to PEEK, PTFE is the chemical resistance champion. It handles virtually all acids, solvents, and corrosive media at temperatures up to 260°C. Additionally, its ultra-low friction coefficient makes it ideal for seals, gaskets, and bearings in chemical processing equipment. PTFE is also FDA-compliant for food contact. See PTFE technical data for full specifications. However, PTFE is soft and creeps under load — consequently, it is not the choice for high-strength structural parts.

Best for: Chemical seals, food-grade gaskets, valve seats, electrical insulators.

POM (Polyoxymethylene / Acetal / Delrin)

Meanwhile, POM is the workhorse of this PEEK PTFE POM comparison. It machines beautifully, holds tight tolerances (±0.01mm is routine), and costs far less than PEEK or PTFE. Furthermore, POM offers high stiffness, low friction, and excellent dimensional stability. In addition, POM absorbs very little moisture, making it stable in humid environments. Read about POM properties on Wikipedia. On the other hand, the main limitation is maximum service temperature around 100°C.

Best for: Gears, bearings, conveyor rollers, snap-fit components, pump housings.

Quick Comparison Table:

PEEK PTFE POM Comparison: How to Decide

First, ask about maximum operating temperature.
Second, consider what chemicals the part will contact.
Finally, evaluate the mechanical load requirements.
Ultimately, the answers will point you to the right material.

In summary, at PlasticPartsCustom we machine all three materials daily on 5-axis CNC equipment with ISO 9001 certified processes. Send your drawing for a free material consultation — we will help you select the optimal plastic for your application.