PTFE Rotary Lip Seals

Product Overview

Pioneer Weston’s high speed PTFE seal range was first introduced during the 1970s to offer a superior performance than existing rubber seals. This is characterized by the following advantages across this range.

Low friction
Aggressive media resistance
Temperature extremes -100 °C / +250 °C
Shaft surface speed up to 30 metres/sec.
Dry running qualities – Reducing breakout friction and stiction
Low lip wear ensuring prolonged service life
Extended shelf life – unaffected by ultraviolet & oxidation
Reduced shaft grooving

The Pioneer Weston range of PTFE lip seals, offered through the ERIKS group, retro fit into hardware dimensions as defined in standards including DIN 3760/3761 and ISO 6194. Non-standard designs and materials are available on request.

PTFE Rotary Lip Styles

Profile Features	Profile Advantages	Applications
Ground metal outer diameter with OD sealant paint Primary PTFE sealing element with hydrodynamic aid Elastomeric gasket	Press fit metal OD for precise location in housing OD sealant paint can help to seal slight housing imperfections Directional hydrodynamic sealing aid to provide pumping action to increase sealing ability	Fuel pumps Compressors
Ground Metal outer diameter with OD sealant paint Primary PTFE sealing element with hydrodynamic aid Additional PTFE wiper lip for R88 Style Elastomeric gasket	Press fit metal OD for precise location in housing The addition of wiper lip offers protection against low to medium dust and dirt ingress from application environment OD sealant paint can help to seal slight housing imperfections Directional hydrodynamic sealing aid to provide pumping action to increase sealing ability	Diesel engine crankshafts Transmissions
Ribbed elastomeric covered outer diameter Primary PTFE sealing element with hydrodynamic aid bonded to inner shell Elastomer dust lip	Ribbed Elastomer OD sealing allows use in housings of increased roughness or with minor surface defects The addition of a dust lip offers protection against low to medium dust and dirt ingress from application environment Directional hydrodynamic sealing aid to provide pumping action to increase sealing ability	Diesel engine crankshafts Gearboxes

Profile

Profile Features

Profile Advantages

Applications

Ground metal outer diameter with OD sealant paint

Primary PTFE sealing element with hydrodynamic aid

Elastomeric gasket

Press fit metal OD for precise location in housing

OD sealant paint can help to seal slight housing imperfections

Directional hydrodynamic sealing aid to provide pumping action to increase sealing ability

Fuel pumps

Compressors

Ground Metal outer diameter with OD sealant paint

Primary PTFE sealing element with hydrodynamic aid

Additional PTFE wiper lip for R88 Style

Elastomeric gasket

Press fit metal OD for precise location in housing

The addition of wiper lip offers protection against low to medium dust and dirt ingress from application environment

OD sealant paint can help to seal slight housing imperfections

Directional hydrodynamic sealing aid to provide pumping action to increase sealing ability

Diesel engine crankshafts

Transmissions

Ribbed elastomeric covered outer diameter

Primary PTFE sealing element with hydrodynamic aid bonded to inner shell

Elastomer dust lip

Ribbed Elastomer OD sealing allows use in housings of increased roughness or with minor surface defects

The addition of a dust lip offers protection against low to medium dust and dirt ingress from application environment

Directional hydrodynamic sealing aid to provide pumping action to increase sealing ability

Diesel engine crankshafts

Gearboxes

Imperial (English)

PTFE Rotary Lip Seal Pt No. Format

†Dimension rounded down to 2 decimal places then multiplied by 100

Shell Materials

Metal	Shell Material Designator
Mild Steel	M
Stainless Steel	S
Aluminium	AL

Elastomer Compounds

Polymer Family	Compound Reference	Colour	Hardness (IRHD)	Temperature Range	Select for..	Elastomer Designator
Fluorocarbon (FKM, A-type)	V-75-198	Black	75	-20 to +200^oC	High temperature performance; high speed applications	F4
Silicone (VMQ)	S-70-197	Red	70	-55 to +230^oC	High and very low temperature; high eccentricity	S2
Polyacrylate (ACM)	A-70-196	Black	70	-30 to +175^oC	High and low temperature capabilities; good compatibility with engine oils	A1

Metric

PTFE Rotary Lip Seals Pt No. Format

PTFE Grades

Material Composition	Compound Reference	Colour	Coefficient of Friction	Temperature Range	Select for..	PTFE Designator
Glass and MoS₂ reinforced PTFE	PF-200	Grey	0.06/0.10	-160 to +290^oC	Low wear, high life, reduced friction	E1
Graphite reinforced PTFE	PF-201	Grey/ Black	0.06/0.10	-200 to +250^oC	Soft shafts, reduced friction	E2

Other materials are available on request.

Special Features Designator

Feature	Function	Selection	Designator
Hydrodynamic Aid	Helps as a pump aid to improve functionality of the seal by transfering fluid away from the lip at high speeds to give a positive impact on the life of the seal.	Clockwise Anti-Clockwise	C A
OD Sealant Paint	Only available on metal cased seals, this sealant paint helps to seal against any housing imperfections.	Red Blue	2 3

Feature

Function

Selection

Designator

Hydrodynamic Aid

Helps as a pump aid to improve functionality of the seal by transfering fluid away from the lip at high speeds to give a positive impact on the life of the seal.

Clockwise

Anti-Clockwise

OD Sealant Paint

Only available on metal cased seals, this sealant paint helps to seal against any housing imperfections.

Red

Blue

If multiple special features are required then these should be expressed using multiple suffixes separated by a “/ ” sequenced as per the above table e.g. An R81 profile with a clockwise hydrodynamic aid and red sealant paint would be as follows; W60050050R81-M/S2/F4/C/2