RPU vs. PMMA
RPU belongs to the thermoset plastics classification, while PMMA belongs to the thermoplastics. There are 18 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 RPU and the bottom bar is PMMA.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 2.2 | |
| 3.2 |
| Elongation at Break, % | 90 | |
| 4.0 |
| Flexural Strength, MPa | 83 | |
| 110 |
| Tensile Strength: Ultimate (UTS), MPa | 60 | |
| 71 |
Thermal Properties
| Maximum Temperature: Autoignition, °C | 380 | |
| 320 |
| Maximum Temperature: Decomposition, °C | 270 | |
| 360 |
| Specific Heat Capacity, J/kg-K | 1750 | |
| 1260 |
| Thermal Conductivity, W/m-K | 0.19 | |
| 0.19 |
| Thermal Expansion, µm/m-K | 63 | |
| 76 |
| Vicat Softening Temperature, °C | 120 | |
| 90 |
Electrical Properties
| Dielectric Strength (Breakdown Potential), kV/mm | 19 | |
| 30 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.2 | |
| 1.2 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.0 | |
| 1.5 |
| Stiffness to Weight: Bending, points | 36 | |
| 42 |
| Strength to Weight: Axial, points | 14 | |
| 17 |
| Strength to Weight: Bending, points | 28 | |
| 32 |
| Thermal Diffusivity, mm2/s | 0.090 | |
| 0.13 |
| Thermal Shock Resistance, points | 31 | |
| 21 |