Cork is a material that is harvested for commercial use primarily from the bark of the Cork Oak tree. As the cork is harvested. Portugal produces 50% of cork worldwide. Cork is made up of suberin, a hydrophobic substance.
In general, cork is made up of suberin (average of about 40%), lignin (22%), polysaccharides (cellulose and hemicellulose) (18%), extractables (15%) and others.