- Suberin (45%) is the main component which covers the walls of the cells and is responsible for its elasticity and compressibility ;
- Lignin (27%), forming the structure of the cell walls, is an insulating compound;
- Polysaccharides (12%) are the components of the cell walls which give cork its texture;
- Tannins (6%) are the polyphenolic compounds which give it colour, and help to protect and preserve the material;
- Ceroids (6%) are the compounds responsible for its impermeability.
- Ash (4%).
