Thermoplastic comparison
PET 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 | PET | PVC, rigid (uPVC) | Difference |
|---|---|---|---|
| Density | 1.37 g/cm³ | 1.4 g/cm³ | PVC, rigid (uPVC) — 2% higher |
| Young's modulus E | 2.9 GPa | 3 GPa | PVC, rigid (uPVC) — 3% higher |
| Tensile strength | 60 MPa | 48 MPa | PET — 25% higher |
| Glass transition Tg | 76 °C | 82 °C | PVC, rigid (uPVC) — 6 °C higher |
Where these numbers come from
- 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.