Cork – an invaluable natural product

Cork is the oldest material known for its outstanding insulation properties. Its unique structure is one of the wonders of nature.

Cork trees grow in Spain, Portugal and in Northern-Africa, but Portugal is the largest producer of cork.  It takes some 20 years for the cork tree to be peeled the first time, afterwards the tree reproduces the cork and it can be peeled again after approx. 9 years.

A cubic centimetre of cork consists of around 12 million cells with a diameter of 0.04 millimetres. The cell wall, which is only one micron thick, consists in turn of more than a hundred ultra-thin lamellae. The air-filled cells with their highly flexible cell walls are "pneumatically" interconnected by minute channels.