Cork

Name:
Cork
Detailed information:
A form of cellulose constituting the light outer bark of the oak tree known as Quercus suber. It grows naturally in southern Europe and northern Africa and has been cultivated in the southwestern U.S. Its special properties are extreme lightness, relative imperviousness to water, resilient structure, and low rate of heat transfer. These account for its usefulness as bottle stoppers, insulation, wallboard, life preservers, gaskets, and sound-deadening insertions. D 0.1–0.25. Combustible.