Spruce-Pine-Fir (SPF) Softwood

Spruce-pine-fir is a wood-based material.

Material Properties

Compressive (Crushing) Strength50 MPa (7.3 x 103 psi)

Density0.5 g/cm3 (31 lb/ft3)

Dielectric Strength (Breakdown Potential)0.5 kV/mm (0.020 V/mil)

Elastic (Young's, Tensile) Modulus16 GPa (2.3 x 106 psi)

Elongation at Break1.5 %

Limiting Oxygen Index (LOI)24 %

Poisson's Ratio0.38

Shear Modulus1.2 GPa (0.17 x 106 psi)

Specific Heat Capacity1380 J/kg-K

Strength to Weight Ratio170 kN-m/kg

Tensile Strength: Ultimate (UTS)85 MPa (12 x 103 psi)

Thermal Conductivity0.12 W/m-K

Thermal Diffusivity0.17 m2/s

Thermal Expansion6.5 µm/m-K

The length of each bar compares the given value to the highest value in the database.

Further Reading

Wood Handbook: Wood as an Engineering Material, Forest Products Laboratory, USDA Forest Service, 1999