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The Cork

PROPERTIES

The Cork

1. Low density and lightness

The cork cells have the 90% occupied by air.

2. Impermeability

The suberin and waxes present in the cell wall make cork virtually impermeable to liquids and gases. The hexagonal pores in its wall filled with air make it inaccessible to other compounds.

3. Low heat transmission and good thermal insulation

The high gas content, the size of the cells and the low adsorption power make it have this property.

4. Acoustic insulation and low sound transmission

The low density and high porosity mean that most of the sound waves are absorbed and transformed into heat energy. Cork is an acoustic corrector, as it absorbs more than 60% of the sound waves that strike the surface.

5. High resistance to movement or high coefficient of friction

The windy effect caused by the surface of the cells make it a very important property when using cork as a capping material.

6. Damping capacity

The cork cells have the 90% occupied by air.

7. Compressibility, elasticity and flexibility

The high air content of its cells allows it to be compressed to almost half without losing flexibility, and to recover its shape and volume when the pressure is stopped. It is the only solid that if compressed on one side, does not increase on the other.

8. Durability, stability and rigidity

The lignin and polysaccharides in its cell wall give it rigidity and make it resistant to the passage of time.

9. hygroscopic

It hydrates depending on the environmental conditions.

10. 100% natural, recyclable and renewable

It is a plant-based material that can be extracted without harming the tree and regenerates itself over the years. It allows a sustainable balance between agroforestry management and human action. In line with current trends in natural materials and sustainable construction. It is a clear example of circular economy.

PROPERTIES

Physical, mechanical and thermal properties of uncrushed, treated or modified cork

Some of the physical and mechanical properties of cork without crushing or treatments or modifications are due to the structural characteristics at the cellular level and the chemical structure of the plant wall (more than 40% of suberin, lignin and polysaccharides).

Propietat Valor Referència
density
120-200 kg ㎥
Angels et al. 2008
Thermal conductivity
0.045 W m ˉ¹ Kˉ¹
Mathias et al. 1997
Acoustic resistance
1.2 x 10 ⁵ kg m ˉ² sˉ¹
Mathias et al. 1997
Coefficient of friction
0.35-0.76 cork/glass
Vaz and Fortes, 1998
Water diffusion coefficient
2.6-2.9 x 10ˉ⁹ m² sˉ¹
Fortes et al. 2004
Electrical conductivity
1.2 x 10 ˉ¹⁰ S mˉ¹ at 25ºC
1.67 x 10ˉ¹³ S mˉ¹ at 50ºC
Silva et al. 2005
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