PBT vs. RPU
PBT belongs to the thermoplastics classification, while RPU belongs to the thermoset plastics. There are 13 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.
For each property being compared, the top bar is PBT and the bottom bar is RPU.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 2.7 to 8.7 | |
| 2.2 |
| Elongation at Break, % | 2.5 to 43 | |
| 90 |
| Flexural Modulus, GPa | 2.6 to 9.1 | |
| 2.0 |
| Flexural Strength, MPa | 79 to 210 | |
| 83 |
| Tensile Strength: Ultimate (UTS), MPa | 58 to 140 | |
| 60 |
Thermal Properties
| Maximum Temperature: Autoignition, °C | 380 | |
| 380 |
| Maximum Temperature: Decomposition, °C | 380 | |
| 270 |
| Specific Heat Capacity, J/kg-K | 1040 to 1200 | |
| 1750 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.3 to 1.5 | |
| 1.2 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.1 to 3.2 | |
| 1.0 |
| Stiffness to Weight: Bending, points | 35 to 45 | |
| 36 |
| Strength to Weight: Axial, points | 12 to 25 | |
| 14 |
| Strength to Weight: Bending, points | 25 to 38 | |
| 28 |