PTFE
PTFE is the most chemical resistant plastic known. It offers
useful mechanical properties from cryogenic temperatures to
over 500° F. Impact strength is high, but tensile strength
and wear resistance are low compared to other engineering
plastics. Coefficient of friction is lower than almost any
other material. "Slippery" surface makes it difficult
to make anything adhere. Use in corrosive or high temperature
applications.
PTFE has become the material choice when looking for a unique
combination of properties to provide performance unmatched
by any other polymer. PTFE and PTFE with selected fillers
offer the following exceptional characteristics:
excellent chemical resistance and exceeds that of all other
thermoplastics and elastomers. Thus the resistance to swelling
is good in almost all media
very wide service temperature range from -260°C to +260°C
PTFE still has some elasticity and therefore it can be used
for seals and constructional parts, for example, with liquefied
gases.
Unsurpassed dielectric properties.The electrical insulating
properties are outstandingly good. They are almost independent
of frequency, temperature and weathering effects. High purity
and inertness the lowest coefficient of friction of any solid
a broad range of mechanical properties .Thermal expansion,
like most plastics, is 10 times that of metals. The thermal
conductivity is low so that removal of heat from bearings
and from other moving seals can lead to problems The material
is not elastomeric but is hard like polyethylene.
For these reasons, elastomeric seals in assemblies cannot
simply be replaced by PTFE seals. With lip seals, provision
must be made for a constant additional contact pressure by
use of springs or by other means. PTFE is filled with graphite,
glass fibers, bronze and carbon to achieve special properties.
PTFE, PTFE, PTFE, PTFE, Poly Tetra Fluoro Ethylene, PTFE,
PTFE
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