PEEK vs. ASTM B817 Type I
PEEK and ASTM B817 type I belong to fundamentally different material chemistries. PEEK is a polymeric material, while ASTM B817 type I is a metal. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 15 material properties with values for both materials. Properties with values for just one material (29, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.
For each property being compared, the top bar is PEEK and the bottom bar is ASTM B817 type I.
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 4.0 to 24 | |
| 100 |
| Elongation at Break, % | 1.6 to 43 | |
| 4.0 to 13 |
| Tensile Strength: Ultimate (UTS), MPa | 97 to 200 | |
| 770 to 960 |
Thermal Properties
| Maximum Temperature: Mechanical, °C | 330 | |
| 340 |
| Melting Onset (Solidus), °C | 340 | |
| 1550 |
| Specific Heat Capacity, J/kg-K | 1390 to 1700 | |
| 560 |
| Thermal Conductivity, W/m-K | 0.25 to 0.93 | |
| 7.1 |
| Thermal Expansion, µm/m-K | 15 to 52 | |
| 9.6 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.3 to 1.5 | |
| 4.4 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.5 to 10 | |
| 13 |
| Stiffness to Weight: Bending, points | 36 to 73 | |
| 35 |
| Strength to Weight: Axial, points | 20 to 41 | |
| 48 to 60 |
| Strength to Weight: Bending, points | 36 to 55 | |
| 42 to 49 |
| Thermal Diffusivity, mm2/s | 0.1 to 0.51 | |
| 2.9 |
| Thermal Shock Resistance, points | 34 to 57 | |
| 54 to 68 |