Thermoplastic comparison
PEEK vs Polypropylene (PP)
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 | Polypropylene (PP) | Difference |
|---|---|---|---|
| Density | 1.3 g/cm³ | 0.905 g/cm³ | PEEK — 44% higher |
| Young's modulus E | 3.6 GPa | 1.4 GPa | PEEK — 2.6× higher |
| Tensile strength | 100 MPa | 34 MPa | PEEK — 2.9× higher |
| Glass transition Tg | 143 °C | -10 °C | PEEK — 153 °C higher |
| Melting point Tm | 343 °C | 165 °C | PEEK — 178 °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.