Material · Engineering Plastics
POM (Delrin / Acetal)
The machinist's favorite: stiff, slippery, stable — plastic parts with metal-like precision.
Price index: $
Instant quote onlineMaterial properties
| Parameter | Value |
|---|---|
| Tensile strength | 70 MPa |
| Yield strength | ~70 MPa |
| Hardness | M89 (Rockwell) |
| Density | 1.41 g/cm³ |
Choose it when
The part should be plastic but needs metal-like precision: POM machines crisply, holds ±0.02 mm routinely and shrugs off humidity that swells nylon. The default for gears and fixtures.
Look elsewhere when
The assembly relies on adhesives or paint (POM low surface energy repels both — use ABS), or service exceeds ~90 °C continuous — step up to PPS or PEEK for heat.
Compatible finishes
As-Machined
The baseline finish: straight off the machine, fastest and cheapest.
Vibratory Tumbling
Batch deburring by the bowl-full: every edge broken, every burr gone, at volume prices.
Laser Marking
Permanent identification with zero dimensional change: serials, logos and codes burned in, not stuck on.
Typical applications
- Precision gears, sprockets and cams
- Bushings and dry-running bearings
- Test fixtures, jigs and robot gripper jaws
- Food machinery contact parts (FDA grades)
Compared with similar grades
| Property | POM (Delrin / Acetal) | ABS | Polycarbonate (PC) | Nylon PA6 |
|---|---|---|---|---|
| Tensile strength | 70 MPa | 40 MPa | 66 MPa | 79 MPa (dry) |
| Yield strength | ~70 MPa | ~40 MPa | ~62 MPa | ~79 MPa (dry) |
| Hardness | M89 (Rockwell) | R105 (Rockwell) | R118 (Rockwell) | R119 (Rockwell, dry) |
| Density | 1.41 g/cm³ | 1.05 g/cm³ | 1.20 g/cm³ | 1.14 g/cm³ |
| Price index | $ | $ | $ | $ |
| Machinability | 5/5 | 4/5 | 3/5 | 3/5 |
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