- Any mechanical seal that serves to fill the space between two objects, generally to prevent leakage between the two objects while under compression.
- A material which may be clamped between faces and acts as a static seal. Gaskets may be cut, formed, or molded to the desired configuration. - ASTM
- Any of a wide variety of seals or packings used between matched machine parts or around pipe joints to prevent the escape of a gas or fluid. - American Heritage Dictionary
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