POM (Polyoxymethylene), also known as acetal, is an engineering plastic with high mechanical strength, excellent dimensional stability and low friction. It is widely used for precision CNC parts, gears, bushings, rings and sliding components in industrial machinery. POM is ideal for applications requiring low wear, tight tolerances and stable mechanical performance.
What is POM (Polyoxymethylene / Acetal)?
POM (Polyoxymethylene), also known as acetal, is a semi-crystalline engineering plastic
valued for its combination of high mechanical strength, excellent dimensional stability,
low coefficient of friction and outstanding machinability.
These properties make POM one of the preferred materials for precision components
and moving parts in industrial machinery.
Due to its stiffness, low moisture absorption and stable performance,
POM is widely used in applications where tight tolerances, low wear and
reliable long-term operation are required.
Engineering Properties of POM
- High mechanical strength: Suitable for load-bearing and stressed components.
- Low coefficient of friction: Ideal for sliding and moving parts.
- Excellent dimensional stability: Maintains tight tolerances in CNC-machined parts.
- Excellent machinability: Easy and precise CNC machining.
- Good wear resistance: Extends service life of moving components.
- Low moisture absorption: Stable performance in humid environments.
- Good electrical insulation: Suitable for certain electrical applications.
Industrial Applications of POM
- Precision gears
- Bushings and bearings
- Rings and rotating components
- Tight-tolerance CNC-machined parts
- Sliders and low-friction components
- Mechanical connectors and motion-transfer elements
- Industrial machinery and mechanical equipment
Typical Technical Properties of POM
| Property | Typical Value |
|---|---|
| Density | 1.39 – 1.41 g/cm³ |
| Tensile strength | 60 – 70 MPa |
| Hardness (Shore D) | 80 – 85 |
| Operating temperature | -40 to +120 °C |
| Moisture absorption | Low |
| Wear resistance | Very good |
Types of POM Materials
- POM-C (Copolymer): The most commonly used grade with good dimensional stability.
- POM-H (Homopolymer): Higher stiffness and strength under load and temperature.
- Reinforced POM grades: Designed for heavy-duty and industrial applications.
Frequently Asked Questions about POM
What is the difference between POM and nylon (PA)?
POM offers higher stiffness, better dimensional stability and lower friction,
making it ideal for precision CNC parts, while nylon (PA) provides better impact resistance.
Is POM suitable for sliding components?
Yes. Due to its very low coefficient of friction, POM is one of the best materials
for sliders and continuously moving parts.
Which industries commonly use POM?
POM is widely used in machinery manufacturing, packaging equipment,
automotive components, mechanical engineering, electronics and precision parts.
For selecting the most suitable POM (Polyoxymethylene / Acetal) grade for your application,
consult the technical team at Tosee Teflon.