POM (Delrin / Acetal)
Stiff, low-friction and dimensionally stable — the premier engineering plastic for precision machined parts.
POM (polyoxymethylene), known by the Delrin brand name, is the go-to engineering plastic for precision machined parts. It is stiff, strong, dimensionally stable and has low friction and excellent fatigue resistance, machining to tighter tolerances than most plastics.
Material properties
| Density | 1.41 g/cm³ |
|---|---|
| Tensile strength | ~70 MPa |
| Max service temp | ~100 °C |
| Stiffness | High |
| Friction | Low |
| Water absorption | Very low |
| Machinability | Excellent |
Typical values for reference; exact properties depend on grade, temper and heat treatment. Full material certification is provided on every order.
Machinability
POM machines beautifully — it cuts cleanly, holds tight tolerances and produces fine finishes, with very low moisture absorption keeping parts dimensionally stable. It is the default choice when a plastic part needs precision.
Typical applications
Related engineering guides
Frequently asked questions
Delrin vs acetal copolymer?
Delrin (homopolymer) has slightly higher strength and stiffness; acetal copolymer has better chemical resistance and less centerline porosity. Both machine excellently.
Why is POM good for machined parts?
Its stiffness, low moisture absorption and clean cutting let POM hold tighter tolerances and finer finishes than most plastics, making it ideal for precision components.