Delrin excels in dimensional stability and low friction for precision parts like gears and bearings. Nylon offers better impact resistance and higher temperature performance but absorbs more moisture, causing dimensional changes.
| Property | Nylon 66 (PA66) | Delrin (POM / Acetal) |
|---|---|---|
| Tensile Strength | 82 MPa (11.9 ksi) | 70 MPa (10.2 ksi) |
| Yield Strength | 69 MPa (10 ksi) | 65 MPa (9.4 ksi) |
| Hardness | Rockwell R120 | Rockwell M80 |
| Density | 1.14 g/cm³ | 1.42 g/cm³ |
| Machinability Rating | 68/100 | 85/100 |
| Thermal Conductivity | 0.26 W/m·K | 0.31 W/m·K |
| Melting Point | 262 °C | 175 °C |
| Tolerance | ±0.05 mm | ±0.02 mm |
| Property | Nylon 66 (PA66) | Delrin (POM / Acetal) | Winner |
|---|---|---|---|
| Dimensional Stability | Fair (moisture) | Excellent | Delrin |
| Moisture Absorption | 2.5% | 0.25% | Delrin |
| Impact Resistance | Excellent | Good | Nylon |
| Friction Coefficient | 0.30-0.40 | 0.20-0.35 | Delrin |
| Temperature Range | Up to 120°C | Up to 100°C | Nylon |
| Machinability | 68/100 | 85/100 | Delrin |
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