By Giles B. Cooke, R. C. Rollins and G. Taylor (Auth.)
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Additional resources for Cork and the Cork Tree
Some composition cork gaskets are used for sealing glass and must be soft. Inner soles for shoes are tough and flexible, while polishing wheels are manufactured dense and hard. Composition cork possesses substantially the same physical characteristics as natural cork and its chemical properties correspond closely to those o f the natural material. Each cork particle, which is composed of thousands o f tiny air-filled cells held together by the natural cork adhesive, is soft, compressible and resilient.
Erlenmeyer and Miiller in a publication about phellonic acid in 1945 checked the work of Drake, Carhart and Mozingo and also found this acid to be 22-hydroxytetracosanoic acid. In 1950 Guillemonat and Strich carried out research on phellonic acid and reported it to have the structure of omega-hydroxybehenic acid of the formula H O - C H - ( C H ) C O O H . Ribas and Curbera< > prepared urea derivatives o f phellonic acid and acetylated phellonic acid. From the percentages of the urea derivatives formed they found phellonic acid to conform to the formula for omega-hydroxybehenic acid.
A soft resilient composition must be used for sealing glass, while dense and hard compositions are required for other applications. Thus, the reader can readily see that composition cork is available in properties and dimensions for many industrial applications that natural cork cannot serve. Sheets of composition cork are used in the manufacture of liners for many types of closures which require sizes not conveniently made in the rod form. Such liners are produced by slicing the composition cork block to the correct thickness and causing the sheet to pass under rapidly revolving cutting dies.