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This patent describes the manufacture of a seal with graded properties that may be used as the bearing seal in a down-hole rock bit. A property gradient is formed in a seal, or a section of the seal, from the exterior surface inwards without changing the seal composition.
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a down-hole environment, and without the need to pressurize the tubing bore. It is sometimes necessary to pass and connect lines or cables through conduits defined in a well-tool. Such lines or cables may include control lines, permanent down-hole cables, permanent encapsulated cables, fibre-optic l
This invention relates to a seal assembly for use in equipment in the electronics manufacturing industry that has a replaceable barrier to shield an elastomeric seal from direct exposure to a plasma. Commercially available seal and barrier shield assemblies comprise a bonded rubber seal and a contin