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Revision: 00/300902
Description:
The chemical resistance of rubber gaskets and compressed fibre
gaskets can be considerably improved by inserting them into a PTFE-envelope.
Because of the good adaptability of PTFE, particularly low sealing
rates can be achieved with adequate gasket pressure.
By choosing particularly suitable styles of PTFE with low
cold-flow (e.g. Dyneon TFM 1600),and by using special combinations
of insert materials, e.g. corrugated metal rings with graphite cover
on both sides, even the most demanding sealing problems (e.g.
enamelled flanges or applications with serious thermal cycling) can
be solved.
Applications:
PTFE-envelope gaskets are being widely used in the food and
beverage industry, as well as in the pharmaceutical and chemical
industry, because of their anti-adhesive properties and the
physiological harmlessness of PTFE. They can be removed quickly and
easily - and without residue - from the flange faces, new gaskets
are installed in no time.
Material properties:
The envelope is made from 100% pure virginal PTFE.
By adding 2%of conductive pigment to the PTFE-resin, or by adding
earth connection points to the corrugated metal ring, electrical
conductivity can be assured.
For use with diffusing or strongly toxic media (e.g. chlorine
gas), special PTFE-envelopes with 0,75mm thick material and
reinforced inner diameter acting as diffusion barrier, can be
produced.
Different styles:
Y-Envelope
Machined PTFE-envelope, normally with only one insert. For
uncritical applications with low temperature and low pressure.
Insert at customerīs option.
UR-Envelope
Machined PTFE-envelope for demanding applications. No notch-effect
at inner diameter. These PTFE-envelopes can be fitted with various
inserts or insert combinations. Larger diameters are produced in
welded (folded tape) construction. A complex welding process -
avoiding the problematic overlapping of the PTFE-material - makes
the production of large PTFE-envelopes possible. Those have the same
features and high quality standard as the smaller, machined,
seamless versions.
UR-D-Envelope
Like style UR, but with additionally reinforced inner diameter as
diffusion barrier. Inserts at customerīs option.
UE-Envelope
Machined PTFE-envelope for flanges according to DIN 2691 (tongue and
groove)and DIN 2692 (male and female). Inserts at customerīs option.
UE-D-Envelope
Like style UE, but with additionally reinforced inner
diameter as diffusion barrier. Inserts at customerīs option.
Please do not hesitate to contact us for any additional
information you might need.
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Disclaimer:
Since all
properties, specifications and application parameters shown throughout
this product information are approximate and may be mutually influenced,
your specific application should not be undertaken without independent
study and evaluation for suitability. All technical data and advice
given is based on experiences TEADIT
have made so far. Failure to select proper sealing products can result
in damage and/or personal injury. Properties, specifications and application
parameters are subject to change without notice. TEADIT &
Sealing Devices do not undertake any liability of any kind whatsoever.
Upon clicking through our product display range you acknowledge this disclaimer
as effective and binding.
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