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Teflon is principally used as a gasket material because
of it's capability to remain unaffected by the majority
of chemicals used in industry. It is also classified, in
most cases, as a food grade material, making it
acceptable to both medical and food production
industries. There are three basic types of Teflon gasket
materials. Virgin Teflon, Filled Teflon and Expanded
Teflon.
Virgin Teflon is by far the least expensive of the three
varieties, and is used in most general applications.
Filled Teflon is a gasket material with a virgin Teflon
base to which a substance is added during manufacture to
improve the sealing characteristics of Teflon. This
"filler" usually is glass or graphite particles although
ceramics has sometimes been used. The resulting gasket
material is strong, yet highly compressible with very
good, though not universal, chemical resistance. |
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Expanded Teflon is virgin Teflon to which a stress
resistance has been added by means of molecular
rearrangement during manufacture. This process ensures
that the molecular chains from which the Teflon is
constructed, do not arrange themselves into set
patterns. This means that expanded Teflon possesses no
structural weakness (grain) and expands and contracts
equally in all directions. Because no additives are
required, expanded Teflon also possesses the unique
chemical resistance of virgin Teflon |
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PTFE / Teflon Industrial Gaskets