EDIT6
Varies by OEM
$$$
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Specs

Pressure Low vacuum, Medium, High
Dynamic Service Speed High
Seal Directionality Unidirectional
Manufacturing Method Combination
Common Modifications Custom combinations energizer and cap materials
Catalog Standards Varies by OEM
Customizable Yes
Comparative Cost $$$
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Special Applications

Optimizable for wide variety of vacuum, cryogenic, nuclear, low friction, high speed, or ultra low breakout friction applications.  Typically single use.