Cork is a material present in the bark of the cork oak. It protects the tree from insects, cold and rain while allowing it to breathe through thin channels called lenticels (the holes in the cork).

Cork is a product of low density, antistatic, which is relatively resistant to fire, good thermal insulation, noise and vibration, as well as water resistant thanks to the suberin that permeates the cells. It is flexible and decomposes slowly.

There are 2 types of cork "natural" and "expanded". Expanded cork is heated to high temperatures, filled with air, which makes it lighter and more efficient thermal resistance. Raw cork is untreated, except scalding, that is why we call it "natural cork" in contrast to the "expanded cork”.

It is traditionally used to produce wine stoppers. More than 80 % of the global production of cork is used to seal the bottles. Nevertheless all these properties together in a natural material, make the precious cork for various applications, including bio-construction.