# 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). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

## Mechanical Properties

Compressive (Crushing) Strength

1.0 *MPa* 0.15 *x 10 ^{3} psi*

Elastic (Young's, Tensile) Modulus

0.020 *GPa* 0.0029 *x 10 ^{6} psi*

Elongation at Break

15 *%*

Shear Modulus

0.010 *GPa* 0.0015 *x 10 ^{6} psi*

Tensile Strength: Ultimate (UTS)

0.85 *MPa* 0.12 *x 10 ^{3} 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/cm ^{3}* 9.4

*lb/ft*

^{3}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 *mm ^{2}/s*

Thermal Shock Resistance

16 *points*

## Followup Questions

## Further Reading

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