PEEK vs. PS
Both PEEK and PS are thermoplastics. There are 22 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.
For each property being compared, the top bar is PEEK and the bottom bar is PS.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 4.0 to 24 | |
| 1.9 to 2.9 |
| Elongation at Break, % | 1.6 to 43 | |
| 1.8 to 40 |
| Flexural Strength, MPa | 150 to 330 | |
| 62 to 80 |
| Impact Strength: Notched Izod, J/m | 78 to 120 | |
| 19 to 45 |
| Tensile Strength: Ultimate (UTS), MPa | 97 to 200 | |
| 32 to 44 |
Thermal Properties
| Glass Transition Temperature, °C | 240 | |
| 100 |
| Maximum Temperature: Autoignition, °C | 600 | |
| 360 to 420 |
| Maximum Temperature: Decomposition, °C | 570 | |
| 320 to 330 |
| Maximum Temperature: Mechanical, °C | 330 | |
| 70 |
| Specific Heat Capacity, J/kg-K | 1390 to 1700 | |
| 1250 to 1400 |
| Thermal Conductivity, W/m-K | 0.25 to 0.93 | |
| 0.14 to 0.22 |
| Thermal Expansion, µm/m-K | 15 to 52 | |
| 80 to 98 |
Electrical Properties
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 3.0 to 14 | |
| 14 to 15 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.3 to 1.5 | |
| 1.0 |
| Limiting Oxygen Index (LOI), % | 38 | |
| 18 |
| Water Absorption After 24 Hours, % | 0.060 to 0.3 | |
| 0.040 to 0.080 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.5 to 10 | |
| 1.0 to 1.5 |
| Stiffness to Weight: Bending, points | 36 to 73 | |
| 40 to 45 |
| Strength to Weight: Axial, points | 20 to 41 | |
| 8.5 to 12 |
| Strength to Weight: Bending, points | 36 to 55 | |
| 22 to 26 |
| Thermal Diffusivity, mm2/s | 0.1 to 0.51 | |
| 0.11 to 0.15 |
| Thermal Shock Resistance, points | 34 to 57 | |
| 11 to 15 |