Thermoplastic comparison
Polyethylene, high-density (HDPE) 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 | Polyethylene, high-density (HDPE) | POM (acetal) | Difference |
|---|---|---|---|
| Density | 0.95 g/cm³ | 1.41 g/cm³ | POM (acetal) — 48% higher |
| Young's modulus E | 1 GPa | 3.1 GPa | POM (acetal) — 3.1× higher |
| Tensile strength | 27 MPa | 65 MPa | POM (acetal) — 2.4× higher |
| Glass transition Tg | -120 °C | -60 °C | POM (acetal) — 60 °C higher |
| Melting point Tm | 131 °C | 175 °C | POM (acetal) — 44 °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.