Delrin (homopolymer POM) is the precision engineering plastic for gears, bearings, and sliding components. It machines like brass, holds tight tolerances, and resists fatigue under cyclic loads.
Mechanical and physical properties
| Property | Value |
|---|---|
| Tensile strength | 70 MPa |
| Elongation at break | 30% |
| Density | 1.42 g/cm³ |
| Modulus | 3.1 GPa |
| Max service temperature | 100 °C |
| Friction coefficient (steel) | 0.21 |
| Machinability rating | Excellent |
Typical applications
- Precision gears and pulleys.
- Bushings and bearings.
- Snap-fit assemblies.
- Conveyor wear strips.
Bonding limits
POM does not glue well — most adhesives bead off. Mechanical fasteners or self-tapping screws into bosses are the recommended assembly methods.
Specifying it on Uretyco
- 1Pick Delrin / POM from the dropdown
Homopolymer (Delrin) or copolymer (Acetron) variants.
- 2Specify tolerance class
Tighter than standard ISO 2768 for precision gears.
- 3Plan for thermal expansion
POM expands ~120 µm/m/K — design fits accordingly.
- 4Avoid bonded joints
Use mechanical fasteners or ultrasonic welding.
Related materials
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