Elastomers for Static Seals at Cryogenic Temperatures
An elastomer O-ring lightly squeezed against a flat surface makes an excellent seal at ordinary temperatures, as has been amply demonstrated by the widespread acceptance of O-ring seals for countless applications. It is natural to hope that similar simple seals can be used for service at cryogenic temperatures. When an ordinary O-ring seal cools, however, the elastomer becomes brittle at some temperature not far below room temperature, then shrinks until it loses contact with the flat surface and the seal fails. If an O-ring seal is to hold at cryogenic temperatures, a way must be found to maintain the contact between the flanges and O-ring as the parts cool.
KeywordsTorque Rubber Nitrile Compressibility Flange
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