RTPU vs. PBI
RTPU belongs to the thermoplastics classification, while PBI belongs to the thermoset plastics. There are 17 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 RTPU and the bottom bar is PBI.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 4.0 | |
| 5.9 |
| Elongation at Break, % | 5.0 | |
| 3.0 |
| Tensile Strength: Ultimate (UTS), MPa | 75 | |
| 160 |
Thermal Properties
| Maximum Temperature: Decomposition, °C | 320 | |
| 590 |
| Specific Heat Capacity, J/kg-K | 1760 | |
| 930 |
| Thermal Conductivity, W/m-K | 0.6 | |
| 0.41 |
| Thermal Expansion, µm/m-K | 100 | |
| 23 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 Hz | 3.6 | |
| 3.4 |
| Dielectric Strength (Breakdown Potential), kV/mm | 24 | |
| 23 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 14 | |
| 13 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.1 | |
| 1.3 |
Common Calculations
| Stiffness to Weight: Axial, points | 2.1 | |
| 2.5 |
| Stiffness to Weight: Bending, points | 50 | |
| 46 |
| Strength to Weight: Axial, points | 20 | |
| 34 |
| Strength to Weight: Bending, points | 38 | |
| 50 |
| Thermal Diffusivity, mm2/s | 0.32 | |
| 0.34 |
| Thermal Shock Resistance, points | 13 | |
| 84 |