Seal Design > Considerations
Considerations, Part 3
applications may present unique challenges to elastomeric seals.
Elastomers are essentially high-viscosity liquids - and as such
will flow under extreme pressure conditions. In applications where
the clearance gap is larger than that recommended for a traditional
o-ring seal, the user should consider backup rings. These flat or
contoured rigid rings are inserted on the low pressure side of the
gland to prevent extrusion. Consideration of backup rings requires
additional gland width to allow for elastomer expansion. In addition,
chemical compatibility and ease of installation are other considerations
when using backup rings.
surface finish of the gland can have a significant impact on the
vacuum performance of seals. The following charts highlight terminology
and processing techniques for specific surface finishes. Special
care should be taken when sealing quartz components - not only
due to the potentially irregular surface finish, but also to "light
piping" effects on clear components in the sealing contact
areas. Polymeric glands offer unique challenges if plastic deformation
and creep of the sealing components are not taken into account.
Plasma Environments and Elastomer Seals
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