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cork oak

plant
Also known as: Quercus suber

Quick Summary

Cork is the outer bark of the cork oak tree (Quercus suber), native to the Mediterranean region. This evergreen oak typically grows to about 60 feet tall and has glossy green leaves.12

The cork is harvested from the tree's outer sheath, which regenerates over several years without harming the tree. This process can be repeated every 8-10 years. The unique structure of cork, composed of air-filled, watertight cells, makes it an excellent insulator and impervious to liquids. It is also very lightweight, being only one-fifth the weight of water.13

While specialized materials have replaced cork in some applications, it remains important as a stopper for wine and other beverages. It is also used in life preservers, fishing equipment, and as reconstituted material for insulation, flooring, and gaskets.13

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