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As a means of contending with a recent asbestos-free tendency, cork or cork rubber, which has been used as gasket material for many years, is being reconsidered. Cork consists of about 20 million independent cells per cm3, its structure is of tetradecahedron which is the most ideal for independent cells, and these cells contain air which accounts for over 50% of the volume of cork. When cork rubber is compressed, the incompressive rubber alters its shape, and shifts its force to cork particles, thus compressing these particles into a small volume, whereby a lateral flow is small, and when a compressive load is removed, the air in the compressed cork cells turns back to atmospheric pressure, and incompressive rubber has enough restoring force to turn back to its original shape, thereby sealability is held in conformity with a change in internal pressure. |
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