‘UNITIZED’ BONDED PTFE LIP SHAFT SEALS
Components offers bonded PTFE lip Seals providing a Sealing
System by unitizing a bonded PTFE wafer type Sealing lip
with steel wear sleeve. This unique version is capable of
handling contamination and oil degradation effects over
longer period of time. This Unitized Seal has many advantages
over assembled *PTFE lip Seals and flouroelastomer lip Seals
due to mainly following reasons: -
- PTFE material is bonded to rubber elastomer.
- Bonder rubber OD or sealant coated metal OD.
- Sealant Coated Inner Steel Ring.
- Axial Sealing lip for excluding dirt.
- Unitized Construction.
- Suitable for Crankshaft Sealing application experiencing
excessive temperature & speed
COMPARISON OF UNITIZED & NON UNITIZED PTFE SEALS.
(Assembled PTFE Seal)
(Bonded PTFE Seal)
PTFE wafers are mechanically held between and inner and
outer cup with an ‘O’ Ring asbestos gasket
preventing leakage internally between the cups. Incorrect
assembly or flaws in any of the components could result
in internal leakage.
PTFE wafer is bonded to the rubber, which also provide
a beaded outer diameter. All potential internal leak paths
are eliminated when the components are bonded together
separate radial PTFE wafer, providing only a barrier to
axial, rather than a radial dirt lip, lengthens the distance
between the primary lip and the dirt lip, giving a longer
leak path. Rotation of the sleeve flange provides a slinger
action radially outward, away from the oil-sealing surface.
O.D. with layer of O.D. sealant offers some protection
against static leakage due to minor bore imperfection
rubber O.D. offers maximum sealability to bore imperfections,
axial scratches, rough finishes high oversize bores, aluminum
Outer metal L-Cup
Oil Sealing PTFE wafer
Dirt lip exclusion PTFE wafer
Inner metal L-Cup
Outside diameter sealant
Seal metal L-Cup
Dirt and oil sealing lip PTFE wafer
unitized bonded PTFE Seal offers several design advantages
over the assembled PTFE, laminated PTFE, and flouroelastomer
on contaminant exclusion with an axial slinger lip.
Reduces the number of components required for the assembled
design, which in turn eliminates the potential leak path.
Combines the Seal and sleeve into one package (unitized),
eliminating possible damage to the PTFE wafer during handling
or installation (unitized implies a single package in which
the major elements cannot be separated).
Provides a rubber O.D. to eliminate O.D. leakage in poorly
manufactured housing bores.
Seals in comparison with flouroelastomer lip Seals offer advantage
of low under lip temperature, good hot and ultra low temperature