Kork.

by Tracy Ann Koch

Cork is an impermeable, buoyant material, a prime-subset of bark tissue tha 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 suberin, a hydrophobic substance, and because of its impermeability, buoyancy, elasticity, and fire resistance, it is used in a variety of products, the most common is for wine stoppers.   

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