Thermoplastic comparison
PEEK vs POM (acetal)
Every value below is a typical room-temperature figure with its source, test method and conditions — the same dataset that drives the calculators.
| Property | PEEK | POM (acetal) | Difference |
|---|---|---|---|
| Density | 1.3 g/cm³ | 1.41 g/cm³ | POM (acetal) — 8% higher |
| Young's modulus E | 3.6 GPa | 3.1 GPa | PEEK — 16% higher |
| Tensile strength | 100 MPa | 65 MPa | PEEK — 54% higher |
| Glass transition Tg | 143 °C | -60 °C | PEEK — 203 °C higher |
| Melting point Tm | 343 °C | 175 °C | PEEK — 168 °C higher |
Where these numbers come from
- Callister & Rethwisch, Materials Science and Engineering, 10th ed.
- CAMPUS plastics database — typical grade datasheet values (campusplastics.com)
Typical room-temperature values for learning and preliminary design; grades vary widely and a supplier datasheet always overrides a textbook figure. Confirm against the datasheet before design work.