PEEK vs. Spruce-pine-fir
PEEK belongs to the thermoplastics classification, while spruce-pine-fir belongs to the wood-based materials. There are 15 material properties with values for both materials. Properties with values for just one material (17, 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 spruce-pine-fir.
Metric UnitsUS Customary Units
Mechanical Properties
| Compressive (Crushing) Strength, MPa | 120 to 300 | |
| 50 |
| Elastic (Young's, Tensile) Modulus, GPa | 4.0 to 24 | |
| 16 |
| Elongation at Break, % | 1.6 to 43 | |
| 1.5 |
| Tensile Strength: Ultimate (UTS), MPa | 97 to 200 | |
| 85 |
Thermal Properties
| Maximum Temperature: Mechanical, °C | 330 | |
| 130 |
| Specific Heat Capacity, J/kg-K | 1390 to 1700 | |
| 1380 |
| Thermal Conductivity, W/m-K | 0.25 to 0.93 | |
| 0.12 |
| Thermal Expansion, µm/m-K | 15 to 52 | |
| 6.5 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.3 to 1.5 | |
| 0.5 |
| Limiting Oxygen Index (LOI), % | 38 | |
| 24 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.5 to 10 | |
| 18 |
| Strength to Weight: Axial, points | 20 to 41 | |
| 47 |
| Strength to Weight: Bending, points | 36 to 55 | |
| 86 |
| Thermal Diffusivity, mm2/s | 0.1 to 0.51 | |
| 0.17 |
| Thermal Shock Resistance, points | 34 to 57 | |
| 58 |