PS vs. RPU
PS belongs to the thermoplastics classification, while RPU belongs to the thermoset plastics. There are 19 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.
For each property being compared, the top bar is PS and the bottom bar is RPU.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 1.9 to 2.9 | |
| 2.2 |
| Elongation at Break, % | 1.8 to 40 | |
| 90 |
| Flexural Strength, MPa | 62 to 80 | |
| 83 |
| Tensile Strength: Ultimate (UTS), MPa | 32 to 44 | |
| 60 |
Thermal Properties
| Maximum Temperature: Autoignition, °C | 360 to 420 | |
| 380 |
| Maximum Temperature: Decomposition, °C | 320 to 330 | |
| 270 |
| Specific Heat Capacity, J/kg-K | 1250 to 1400 | |
| 1750 |
| Thermal Conductivity, W/m-K | 0.14 to 0.22 | |
| 0.19 |
| Thermal Expansion, µm/m-K | 80 to 98 | |
| 63 |
| Vicat Softening Temperature, °C | 100 to 110 | |
| 120 |
Electrical Properties
| Dielectric Strength (Breakdown Potential), kV/mm | 18 to 20 | |
| 19 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 14 to 15 | |
| 13 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.0 | |
| 1.2 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.0 to 1.5 | |
| 1.0 |
| Stiffness to Weight: Bending, points | 40 to 45 | |
| 36 |
| Strength to Weight: Axial, points | 8.5 to 12 | |
| 14 |
| Strength to Weight: Bending, points | 22 to 26 | |
| 28 |
| Thermal Diffusivity, mm2/s | 0.11 to 0.15 | |
| 0.090 |
| Thermal Shock Resistance, points | 11 to 15 | |
| 31 |