Thermoplastic comparison
PET vs Polysulfone (PSU)
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 | Polysulfone (PSU) | Difference |
|---|---|---|---|
| Density | 1.37 g/cm³ | 1.24 g/cm³ | PET — 10% higher |
| Young's modulus E | 2.9 GPa | 2.5 GPa | PET — 16% higher |
| Tensile strength | 60 MPa | 70 MPa | Polysulfone (PSU) — 17% higher |
| Glass transition Tg | 76 °C | 185 °C | Polysulfone (PSU) — 109 °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.