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Extrusion Gaps
An effective way to increase a seal’s
performance is to closely control the extrusion gap or
E-gap. (See illustration above). As
temperature increases, the seal jacket
will tend to soften and a smaller
E-gap will need to be maintained so that
the seal will not extrude. The same is
true for high pressures. Identical seals
will perform differently based on the
consistency of the E-gap. If a seal is
allowed to extrude, it will not be able to
maintain positive sealing as long as a
seal that does not extrude. Table 1.9
lists recommended E-gaps at various
pressures for standard AccuSeal cross
sections.
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