Delrin vs ABS for CNC Machining: Precision vs Economy
Delrin is the precision engineering choice with superior dimensional stability, low friction, and chemical resistance. ABS is the economical option for prototypes and parts where dimensional precision is less critical.
Side-by-Side Property Comparison
| Property | Delrin (POM / Acetal) | ABS (Acrylonitrile Butadiene Styrene) |
|---|---|---|
| Tensile Strength | 70 MPa (10.2 ksi) | 44 MPa (6.4 ksi) |
| Yield Strength | 65 MPa (9.4 ksi) | 43 MPa (6.2 ksi) |
| Hardness | Rockwell M80 | Rockwell R105 |
| Density | 1.42 g/cm³ | 1.05 g/cm³ |
| Machinability Rating | 85/100 | 82/100 |
| Thermal Conductivity | 0.31 W/m·K | 0.17 W/m·K |
| Melting Point | 175 °C | 200–260 °C (processing range) |
| Tolerance | ±0.02 mm | ±0.05 mm |
Key Differences
| Property | Delrin (POM / Acetal) | ABS (Acrylonitrile Butadiene Styrene) | Winner |
|---|---|---|---|
| Dimensional Stability | Excellent | Good | Delrin |
| Friction Coefficient | 0.20-0.35 | 0.40-0.50 | Delrin |
| Tensile Strength | 70 MPa | 44 MPa | Delrin |
| Cost | ~$5-10/kg | ~$3/kg | ABS |
| Machinability | 85/100 | 82/100 | Delrin |
| Paintability | Poor | Excellent | ABS |
Which Material Should You Choose?
Choose Delrin (POM / Acetal) when:
- Precision mechanical parts
- Gears, bearings, and bushings
- Low-friction sliding components
- Parts requiring chemical resistance
- Food contact applications
Choose ABS (Acrylonitrile Butadiene Styrene) when:
- Prototypes and visual models
- Housings and enclosures
- Parts to be painted or plated
- Budget-constrained projects
- Non-precision consumer parts
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