Thermoplastic comparison
POM (acetal) vs PVC, rigid (uPVC)
Every value below is a typical room-temperature figure with its source, test method and conditions — the same dataset that drives the calculators.
| Property | POM (acetal) | PVC, rigid (uPVC) | Difference |
|---|---|---|---|
| Density | 1.41 g/cm³ | 1.4 g/cm³ | POM (acetal) — 1% higher |
| Young's modulus E | 3.1 GPa | 3 GPa | POM (acetal) — 3% higher |
| Tensile strength | 65 MPa | 48 MPa | POM (acetal) — 35% higher |
| Glass transition Tg | -60 °C | 82 °C | PVC, rigid (uPVC) — 142 °C higher |
Where these numbers come from
- CAMPUS plastics database — typical grade datasheet values (campusplastics.com)
- Callister & Rethwisch, Materials Science and Engineering, 10th ed.
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.