POM (Acetal) — Polyoxymethylene
High strength and stiffness with excellent dimensional stability — one of the easiest engineering plastics to machine to tight tolerances.
POM (acetal), available as POM-C copolymer and POM-H homopolymer, combines high mechanical strength, rigidity and fatigue resistance with very low moisture absorption. It holds its dimensions better than almost any other engineering plastic, making it ideal for precision machined components.
With low friction and excellent wear resistance, POM is widely used for gears, rollers, bushings and precision parts across automotive, industrial and consumer applications.
Key Properties
| Density | 1.41 – 1.43 g/cm³ |
| Service temperature | −50 to +90 °C (short-term +140 °C) |
| Coefficient of friction | 0.20 – 0.35 |
| Water absorption | 0.2 % (24 h) |
| Tensile strength | 60 – 75 MPa |
| Flexural modulus | 2,600 – 3,100 MPa |
| Machinability | Excellent — best-in-class for tight tolerance |
| Chemical resistance | Good against fuels, solvents and neutral chemicals |
Typical Applications
- Precision gears and racks
- Rollers, bushings and bearings
- Conveyor and handling components
- Pump and valve parts
- Automotive interior and functional parts
- Electrical and mechanical precision parts
Available Forms & Sizes
| Form | Size range | Notes |
|---|---|---|
| Sheet / Plate | 1 – 100 mm thick | Natural, black, and colours |
| Rod | 6 – 200 mm diameter | POM-C and POM-H |
| Custom parts | To your drawing | CNC turned and milled |
Grades & Modifications
Supplied as POM-C copolymer (better chemical resistance) and POM-H homopolymer (higher strength and stiffness). Modified grades include glass-fibre reinforced, anti-static, UV-stabilised and food-contact compliant.
Machining & Fabrication
POM is the benchmark for machinability. We CNC turn, mill and drill to tolerances as tight as ±0.02 mm, and can produce high volumes with consistent surface finish. No post-machining stress relief is usually required.
Need POM to your specification?
Send us your drawing, sizes and quantity — we will quote within 24 hours.