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Cork vs. Glass-bonded Mica

Cork and glass-bonded mica belong to fundamentally different material chemistries. Cork is a polymeric material, while glass-bonded mica is ceramic. 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 (9, 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 glass-bonded mica.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 1.0
270
Elastic (Young's, Tensile) Modulus, GPa 0.020
71
Tensile Strength: Ultimate (UTS), MPa 0.85
39

Thermal Properties

Specific Heat Capacity, J/kg-K 2000
500
Thermal Conductivity, W/m-K 0.040
23
Thermal Expansion, µm/m-K 200
6.7

Electrical Properties

Dielectric Strength (Breakdown Potential), kV/mm 1.5
20

Otherwise Unclassified Properties

Density, g/cm3 0.15
2.6

Common Calculations

Stiffness to Weight: Axial, points 0.074
15
Stiffness to Weight: Bending, points 60
52
Strength to Weight: Axial, points 1.6
4.1
Strength to Weight: Bending, points 13
9.7
Thermal Diffusivity, mm2/s 0.13
18
Thermal Shock Resistance, points 16
5.9