Thermoplastic comparison
PBT (polybutylene terephthalate) vs TPU (thermoplastic polyurethane)
Every value below is a typical room-temperature figure with its source, test method and conditions — the same dataset that drives the calculators.
| Property | PBT (polybutylene terephthalate) | TPU (thermoplastic polyurethane) | Difference |
|---|---|---|---|
| Density | 1.31 g/cm³ | 1.2 g/cm³ | PBT (polybutylene terephthalate) — 9% higher |
| Young's modulus E | 2.6 GPa | 0.03 GPa | PBT (polybutylene terephthalate) — 86.7× higher |
| Tensile strength | 55 MPa | 40 MPa | PBT (polybutylene terephthalate) — 38% higher |
| Glass transition Tg | 45 °C | -35 °C | PBT (polybutylene terephthalate) — 80 °C higher |
Where these numbers come from
- 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.