PEEK vs POM-C: Which Engineering Plastic Should You Specify for Precision Components?

Introduction

When specifying engineering plastics for precision mechanical components, two materials consistently appear on the shortlist: PEEK (Polyetheretherketone) and POM-C (Polyoxymethylene Copolymer). Both are high-performance thermoplastics with excellent machinability and dimensional stability, but they serve very different application requirements.

This guide compares PEEK and POM-C across the key technical parameters that matter to design engineers and procurement teams, helping you make an informed material selection decision.

What is PEEK?

PEEK is a semi-crystalline high-performance thermoplastic known for its exceptional mechanical strength, chemical resistance and thermal stability. It maintains its physical properties at continuous operating temperatures of up to 250 degrees Celsius, making it one of the most capable engineering plastics available.

PEEK is non-flammable and carries high radiation and steam resistance. It is widely specified in semiconductor manufacturing, chemical processing plants, aerospace and medical device applications where extreme performance is a non-negotiable requirement.

What is POM-C?

POM-C is a semi-crystalline thermoplastic acetal copolymer known for its excellent dimensional stability, good frictional properties and high load-bearing capacity. It offers low moisture absorption, making it suitable for components operating in wet or humid environments without dimensional change.

POM-C is one of the most widely used engineering plastics in precision mechanical engineering. It is specified for gearboxes, guide rollers, bearings and food processing components where dimensional accuracy and consistent performance are critical.

PEEK vs POM-C: Key Technical Comparison

When to Specify PEEK

PEEK is the correct material choice when your application involves one or more of the following requirements:

High Operating Temperatures If your component operates continuously above 100 degrees Celsius, POM-C will not perform reliably. PEEK maintains its mechanical properties up to 250 degrees Celsius, making it the preferred choice for high-temperature industrial environments.

Aggressive Chemical Exposure PEEK offers excellent resistance to a wide range of aggressive chemicals including concentrated acids, bases and organic solvents. For applications in chemical processing or electroplating plants, PEEK provides a level of chemical resistance that POM-C cannot match.

Semiconductor and Electronics Manufacturing PEEK is widely specified in semiconductor systems and LCD manufacturing plants where material purity, dimensional stability and resistance to process chemicals are mandatory requirements. Conductive grades such as PEEK ELS EC are available for static-sensitive environments.

Structural Load-Bearing Applications Where very high mechanical strength and creep resistance are required under sustained load at elevated temperatures, PEEK outperforms POM-C significantly.

When to Specify POM-C

POM-C is the correct material choice when your application involves one or more of the following requirements:

Precision Dimensional Tolerances at Moderate Temperatures POM-C offers outstanding dimensional stability and is highly machinable to tight tolerances. For precision components operating at temperatures below 100 degrees Celsius, POM-C delivers reliable performance at a fraction of the cost of PEEK.

Wet and Humid Environments POM-C has very low moisture absorption, meaning its dimensional and mechanical properties remain stable in wet operating conditions. This makes it ideal for components exposed to water, process fluids and cleaning agents.

Food Processing Applications POM-C Natural and Black carry full FDA and EN food contact compliance. The Blue RAL5002 variant adds visual fragment detection capability, making it the preferred choice for food processing environments with strict contamination control requirements.

Cost-Sensitive Procurement For applications where the extreme performance of PEEK is not required, POM-C delivers excellent mechanical performance at a significantly lower material cost. For procurement teams managing large volume orders of standard precision components, POM-C offers the best value.

Available Variants

PEEK Variants at Plastix Factory Plastix Factory supplies five PEEK variants including standard Natural and Black grades, ELS EC conductive grade, CF30 carbon fibre reinforced, GF30 glass fibre reinforced and HPV grade with PTFE carbon fibre and graphite for high wear applications.

POM-C Variants at Plastix Factory Plastix Factory supplies four POM-C variants including Natural and Black standard grades, Blue RAL5002 for food safety applications, ESD AST antistatic grade and ELS EC conductive grade for semiconductor and electronics applications.

Available Forms

Both PEEK and POM-C are available from Plastix Factory as sheets, round bars, tubes, blocks and CNC-machined finished parts manufactured to customer drawings. Standard stock dimensions are available for prompt delivery. Custom dimensions are produced as made-to-order.

Summary: Which Should You Choose?

Choose PEEK when your application demands high operating temperatures above 100 degrees Celsius, aggressive chemical resistance, radiation resistance or extreme mechanical strength in demanding industrial environments.

Choose POM-C when your application requires precise dimensional tolerances at moderate temperatures, food contact compliance, wet environment suitability or cost-effective performance in general mechanical engineering applications.

If you are unsure which material is right for your application, the Plastix Factory technical team can review your specifications and recommend the most suitable grade and form for your requirements.

Request a Quote

Plastix Factory supplies both PEEK and POM-C in standard stock dimensions and custom formats from four global production facilities in Austria, Germany, South Korea and the United Arab Emirates. All production is certified to ISO 9001:2015 and ISO 14001:2015.

Contact our technical team or visit our B2B portal at plastixfactory.com/store to place your order.