Delrin (POM)
Delrin (POM Acetal Homopolymer) – Precision Engineering Plastic with Metal-Like Machinability
Delrin is DuPont s trade name for acetal homopolymer (POM-H), widely regarded as the engineering plastic that most closely approximates metal in machinability and dimensional stability. Its low friction coefficient, excellent wear resistance, and ability to hold tight machining tolerances make it the first choice for precision plastic gears, bushings, and snap-fit components replacing metal parts.
Key Properties
- Tensile Strength: 69 MPa
- Continuous Service Temperature: Up to 175°C
- Coefficient of Friction: Very low (0.1–0.2 vs steel)
- Density: 1.42 g/cm³
- Dimensional Stability: Excellent
- Standard: ASTM D4181
Common Applications
Precision gears, bearings and bushings, snap-fit assemblies, pump impellers, valve bodies, conveyor components, and any precision-machined plastic part requiring tight tolerances, low friction, and good wear resistance.
Material properties
| Material name | Delrin (POM) |
|---|---|
| Type | Plastics |
| Standard code | ASTM D4181 |
| Tensile strength (MPa) | 69 |
| Yield strength (MPa) | 62 |
| Fatigue strength (MPa) | 31 |
| Elongation (%) | 25 |
| Hardness (Brinell) | — |
| Density (g/cm³) | 1.42 |
| Electrical resistivity (µΩ·in) | — |
| Thermal conductivity (W/m·K) | 0.4 |
| Melting range (°C) | 175 |
| Weldability | N/A |
| Formability | Good |
| Shear modulus | 1.6 |
| Industry code | delrin |