RPU vs. PPSU
RPU belongs to the thermoset plastics classification, while PPSU belongs to the thermoplastics. There are 19 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.
For each property being compared, the top bar is RPU and the bottom bar is PPSU.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 2.2 | |
| 3.6 |
| Elongation at Break, % | 90 | |
| 26 |
| Flexural Modulus, GPa | 2.0 | |
| 4.7 |
| Flexural Strength, MPa | 83 | |
| 130 |
| Tensile Strength: Ultimate (UTS), MPa | 60 | |
| 95 |
Thermal Properties
| Maximum Temperature: Autoignition, °C | 380 | |
| 580 |
| Maximum Temperature: Decomposition, °C | 270 | |
| 560 |
| Specific Heat Capacity, J/kg-K | 1750 | |
| 970 |
| Thermal Conductivity, W/m-K | 0.19 | |
| 0.24 |
| Thermal Expansion, µm/m-K | 63 | |
| 45 |
Electrical Properties
| Dielectric Strength (Breakdown Potential), kV/mm | 19 | |
| 16 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 13 | |
| 14 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.2 | |
| 1.4 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.0 | |
| 1.4 |
| Stiffness to Weight: Bending, points | 36 | |
| 36 |
| Strength to Weight: Axial, points | 14 | |
| 19 |
| Strength to Weight: Bending, points | 28 | |
| 33 |
| Thermal Diffusivity, mm2/s | 0.090 | |
| 0.17 |
| Thermal Shock Resistance, points | 31 | |
| 42 |