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Cork

Cork is a wood-based material. It has the highest ductility among wood-based materials. In addition, it has the highest heat capacity and the lowest tensile strength. The graph bars on the material properties cards below compare cork to other wood-based materials (top) and the entire database (bottom).

Mechanical Properties

Compressive (Crushing) Strength

1.0 MPa 0.15 x 103 psi

Elastic (Young's, Tensile) Modulus

0.020 GPa 0.0029 x 106 psi

Elongation at Break

15 %

Shear Modulus

0.010 GPa 0.0015 x 106 psi

Tensile Strength: Ultimate (UTS)

0.85 MPa 0.12 x 103 psi

Thermal Properties

Specific Heat Capacity

2000 J/kg-K 0.48 BTU/lb-°F

Thermal Conductivity

0.040 W/m-K 0.023 BTU/h-ft-°F

Thermal Expansion

200 µm/m-K

Other Material Properties

Density

0.15 g/cm3 9.4 lb/ft3

Dielectric Strength (Breakdown Potential)

1.5 kV/mm 0.059 V/mil

Common Calculations

Stiffness to Weight: Axial

0.074 points

Stiffness to Weight: Bending

60 points

Strength to Weight: Axial

1.6 points

Strength to Weight: Bending

13 points

Thermal Diffusivity

0.13 m2/s

Thermal Shock Resistance

16 points

Followup Questions

Further Reading

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