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Spruce-pine-fir vs. PETG

Spruce-pine-fir belongs to the wood-based materials classification, while PETG belongs to the thermoplastics. There are 13 material properties with values for both materials. Properties with values for just one material (19, 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 PETG.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 50
55
Elastic (Young's, Tensile) Modulus, GPa 16
2.2
Tensile Strength: Ultimate (UTS), MPa 85
53

Thermal Properties

Specific Heat Capacity, J/kg-K 1380
1200
Thermal Conductivity, W/m-K 0.12
0.29
Thermal Expansion, µm/m-K 6.5
68

Electrical Properties

Dielectric Strength (Breakdown Potential), kV/mm 0.5
16

Otherwise Unclassified Properties

Density, g/cm3 0.5
1.3

Common Calculations

Stiffness to Weight: Axial, points 18
1.0
Strength to Weight: Axial, points 47
12
Strength to Weight: Bending, points 86
25
Thermal Diffusivity, mm2/s 0.17
0.19
Thermal Shock Resistance, points 58
25