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Spruce-pine-fir vs. PEI

Spruce-pine-fir belongs to the wood-based materials classification, while PEI belongs to the thermoplastics. There are 16 material properties with values for both materials. Properties with values for just one material (15, 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 PEI.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 50
140 to 180
Elastic (Young's, Tensile) Modulus, GPa 16
3.4 to 5.6
Elongation at Break, % 1.5
3.0 to 34
Tensile Strength: Ultimate (UTS), MPa 85
110 to 160

Thermal Properties

Maximum Temperature: Mechanical, °C 130
170
Specific Heat Capacity, J/kg-K 1380
1050 to 1220
Thermal Conductivity, W/m-K 0.12
0.18 to 0.23
Thermal Expansion, µm/m-K 6.5
20 to 53

Electrical Properties

Dielectric Strength (Breakdown Potential), kV/mm 0.5
30 to 33

Otherwise Unclassified Properties

Density, g/cm3 0.5
1.3 to 1.5
Limiting Oxygen Index (LOI), % 24
47 to 50

Common Calculations

Stiffness to Weight: Axial, points 18
1.5 to 2.1
Strength to Weight: Axial, points 47
24 to 30
Strength to Weight: Bending, points 86
40 to 44
Thermal Diffusivity, mm2/s 0.17
0.11 to 0.14
Thermal Shock Resistance, points 58
44 to 100