PEEK vs. RPU
PEEK belongs to the thermoplastics classification, while RPU belongs to the thermoset plastics. There are 18 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.
For each property being compared, the top bar is PEEK and the bottom bar is RPU.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 4.0 to 24 | |
| 2.2 |
| Elongation at Break, % | 1.6 to 43 | |
| 90 |
| Flexural Modulus, GPa | 3.8 to 19 | |
| 2.0 |
| Flexural Strength, MPa | 150 to 330 | |
| 83 |
| Tensile Strength: Ultimate (UTS), MPa | 97 to 200 | |
| 60 |
Thermal Properties
| Maximum Temperature: Autoignition, °C | 600 | |
| 380 |
| Maximum Temperature: Decomposition, °C | 570 | |
| 270 |
| Specific Heat Capacity, J/kg-K | 1390 to 1700 | |
| 1750 |
| Thermal Conductivity, W/m-K | 0.25 to 0.93 | |
| 0.19 |
| Thermal Expansion, µm/m-K | 15 to 52 | |
| 63 |
Electrical Properties
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 3.0 to 14 | |
| 13 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.3 to 1.5 | |
| 1.2 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.5 to 10 | |
| 1.0 |
| Stiffness to Weight: Bending, points | 36 to 73 | |
| 36 |
| Strength to Weight: Axial, points | 20 to 41 | |
| 14 |
| Strength to Weight: Bending, points | 36 to 55 | |
| 28 |
| Thermal Diffusivity, mm2/s | 0.1 to 0.51 | |
| 0.090 |
| Thermal Shock Resistance, points | 34 to 57 | |
| 31 |