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Cork (material) For other uses, see Cork. Cork is an impermeable buoyant material, the phellem layer of bark tissue that is harvested for commercial use primarily from Quercus suber (the Cork Oak), which is endemic to southwest Europe and northwest Africa.
Cork is composed of dead cells that accumulate on the outer surface of the cork oak tree. Harvests occur at nine-year intervals, when the cork layer reaches a thickness of 1-2 in 12-5 cm). The harvest from a young tree yields about 35 lb (16 kg) of cork, while the yield for an older tree may be 500 lb (225 kg).