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Spruce-pine-fir vs. PEEK

Spruce-pine-fir belongs to the wood-based materials classification, while PEEK belongs to the thermoplastics. 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 spruce-pine-fir and the bottom bar is PEEK.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 50
120 to 300
Elastic (Young's, Tensile) Modulus, GPa 16
4.0 to 24
Elongation at Break, % 1.5
1.6 to 43
Tensile Strength: Ultimate (UTS), MPa 85
97 to 200

Thermal Properties

Maximum Temperature: Mechanical, °C 130
330
Specific Heat Capacity, J/kg-K 1380
1390 to 1700
Thermal Conductivity, W/m-K 0.12
0.25 to 0.93
Thermal Expansion, µm/m-K 6.5
15 to 52

Otherwise Unclassified Properties

Density, g/cm3 0.5
1.3 to 1.5
Limiting Oxygen Index (LOI), % 24
38

Common Calculations

Stiffness to Weight: Axial, points 18
1.5 to 10
Strength to Weight: Axial, points 47
20 to 41
Strength to Weight: Bending, points 86
36 to 55
Thermal Diffusivity, mm2/s 0.17
0.1 to 0.51
Thermal Shock Resistance, points 58
34 to 57