The
necessity to use lubricants with metal bearings and problems associated with
their presence pave the way to Efalon® (PTFE) which can be used without lubrication
and in a wider range of applications. Low friction coefficient, wide operation temperature
range, perfect chemical resistance and sufficient
mechanical properties make
Efalon® (PTFE) the best choice
as bearing material.
At more
convenient prices and without compromising on performance, Kestamid®
can also be used as
bearing material if there are low velocity and low temperature.
Do not require lubrication, eliminate problems caused
by lubricants. As lubricants lose their oiling advantages as a
result of decomposition, heat is emitted through evaporation.
Are resistant to chemicals and corrosion.
Do not damage or wear out the surface of the mill with which they work
together.
Reduce friction.
Start-up load
is minimum. There is no excess load on engines at the initial motion.
Work vibration free and silently.
Depending on type of filling material, they suppot
electrical insulation and conductivity.
Are low maintenance.
Prevent product contamination.
Are nonconductive.
Compounded Efalon® (PTFE)
is more resistant to
wear and deformation under load compared to virgin Efalon® (PTFE).
Compounded Efalon® (PTFE)'s
high thermal conductivity, low thermal expansion, high
resistance to cold flow, considerably low
friction coefficient and wide operation temperature range prove it
more advantageous over virgin material.
Virgin Efalon® (PTFE) materials are used where
chemical resistance of compounded Efalon® (PTFE) bearings is
insufficient and and in designs that run at low velocity and low load.
The most typical bearing material is carbon-filled Efalon® (PTFE).
It has high resistance to deformation under load and wear
and has high thermal conduction. Generally K-25 (25% carbon PTFE)
should be preferred when tensile strength and elongation
at break are important. K-35 (35% carbon PTFE) should be
preferred when wear resistance and resistance under load
are important.
Tolerance on inner
diameter should be calculated carefully to extend bearing life.
PTFE bearings are fit tightly into
their inserts. In
bearings with up to 25mm of outer diameter, a 0.01mm/mm fitting
tolerance should be applied. At larger diameters, minimum fitting
tolerance should be 0.1mm+(0.005xOuter diameter).
In general, bearing wall thickness should be designed equal
or less than 1/8th of inner diameter.
At the onset, we recommend running PTFE
bearings for 30 minutes at a velocity which is half the regular
speed and lubricating them with a few drops of heat
resistant lubricant.
All Rights Reserved. Efalon®,
Kestamid®,
Ulpolen®
are trademarks of
Polikim A.S..
Teflon® is
a trademark of DuPont.
