PEEK vs. Epoxy
PEEK belongs to the thermoplastics classification, while epoxy belongs to the thermoset plastics. 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 PEEK and the bottom bar is epoxy.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 4.0 to 24 | |
| 2.4 |
| Elongation at Break, % | 1.6 to 43 | |
| 4.5 |
| Tensile Strength: Ultimate (UTS), MPa | 97 to 200 | |
| 67 |
Thermal Properties
| Glass Transition Temperature, °C | 240 | |
| 120 |
| Maximum Temperature: Autoignition, °C | 600 | |
| 430 |
| Maximum Temperature: Decomposition, °C | 570 | |
| 430 |
| Maximum Temperature: Mechanical, °C | 330 | |
| 130 |
| Specific Heat Capacity, J/kg-K | 1390 to 1700 | |
| 1500 |
| Thermal Conductivity, W/m-K | 0.25 to 0.93 | |
| 0.2 |
| Thermal Expansion, µm/m-K | 15 to 52 | |
| 100 |
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 | |
| 1.3 |
| Limiting Oxygen Index (LOI), % | 38 | |
| 20 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.5 to 10 | |
| 1.0 |
| Stiffness to Weight: Bending, points | 36 to 73 | |
| 34 |
| 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 | |
| 0.1 |
| Thermal Shock Resistance, points | 34 to 57 | |
| 20 |