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Cork vs. Automotive Grey Cast Iron

Cork and automotive grey cast iron belong to fundamentally different material chemistries. Cork is a polymeric material, while automotive grey cast iron is a metal. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 14 material properties with values for both materials. Properties with values for just one material (16, 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 cork and the bottom bar is automotive grey cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 0.020
180
Elongation at Break, % 15
9.6 to 14
Shear Modulus, GPa 0.010
69 to 70
Tensile Strength: Ultimate (UTS), MPa 0.85
140 to 290

Thermal Properties

Specific Heat Capacity, J/kg-K 2000
490
Thermal Conductivity, W/m-K 0.040
41 to 43
Thermal Expansion, µm/m-K 200
12 to 14

Otherwise Unclassified Properties

Density, g/cm3 0.15
7.5 to 7.6

Common Calculations

Stiffness to Weight: Axial, points 0.074
13
Stiffness to Weight: Bending, points 60
25
Strength to Weight: Axial, points 1.6
5.2 to 11
Strength to Weight: Bending, points 13
8.0 to 13
Thermal Diffusivity, mm2/s 0.13
11 to 12
Thermal Shock Resistance, points 16
4.2 to 8.6