Thermoplastic comparison
PEEK vs PHB (polyhydroxybutyrate, a PHA)
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 | PHB (polyhydroxybutyrate, a PHA) | Difference |
|---|---|---|---|
| Density | 1.3 g/cm³ | 1.25 g/cm³ | PEEK — 4% higher |
| Young's modulus E | 3.6 GPa | 3.5 GPa | PEEK — 3% higher |
| Tensile strength | 100 MPa | 40 MPa | PEEK — 2.5× higher |
| Glass transition Tg | 143 °C | 4 °C | PEEK — 139 °C higher |
| Melting point Tm | 343 °C | 177 °C | PEEK — 166 °C higher |
Where these numbers come from
- Callister & Rethwisch, Materials Science and Engineering, 10th ed.
- Sudesh, Abe & Doi, Prog. Polym. Sci. 25 (2000) 1503–1555 — PHA structure & properties review
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.