PTFE-SS316 Bearing seals

Perfect for use in sea water and other harsh environments!

Bearing rotary shaft seals with PTFE sealing lip and stainless steel 316 housing for difficult and extreme conditions, for use underwater, dirt and chemicals. 

Design Features:

  • Dual excluder PTFE seal lip, 316 stainless steel housing
  • Useable under high pressure up to 40 bar
  • Suitable for unhardened shafts as well
  • Very suitable for high speed up to 30m/s
  • For wide temperature range from -79 C up to 260 C
  • Excellent chemical resistance
  • Useable in food and pharma applications (FDA)
  • Good dry running capability
  • Wear resistant and low friction

 

Seal lift

Normal stresses in the grease, due to the high shear rates in the area
or the seal contact, generate an additional contact force on the seal lip that in addition to the lift generated by micro elastohydrodynamic lubrication. Because the design and the PTFE lips fits more tight and tensioned around the shaft this lift effect will be limited. Making it less easy for dirt to get under the lip and wear a grove into the shaft.

In grease lubricated Extreme Bearings, it is not only the small gap between the seal lip and the shaft that provides sealing against contaminants. The grease in the grease in between the sealing lips also provide a sealing action.

 

2 Types

Extreme Bearing supplies 2 standard PTFE Bearing lip seals.

CC

Flushing dirt away

Type CC is the version with 2 lips standing to the outside to keep the elements and unwanted intruders out of the bearing housing. When the housing is filled up with grease, the lips will release the excess grease and drain the contamination from the sealing surface

CL

Maintenance free

Type CL can not drain the contamination from the sealing surface because this seal is equipped with an additional third lip intended to keep the fat inside. The PTFE material makes it possible for both other sealing lips not need to be lubricated, this makes the CL seal an unique seal for bearing assemblies that not can be regreased.

CC Type, Double lip

CL Type Triple lip

Examples of grease diagram using  CC and CL seals

CC-AS seal assembly

CC-CL seal assembly

CC-CC seal assembly

Mounting CC and CL chemical resistant PTFE Seals

Fitting Tips:

  • PTFE shaft seals are press fitted into receiving hole.

We recommend the sealing rings are glued into the receiving hole. Use sealing compound (e.g. Loctite 601,641)

  • Use conical fitting tool to protect sealing lip
  • Before fitting, the seal lip must be inspected for contamination/damage
  • The sealing lips must not be deformed
  • Seals may be fitted without lubrication

Preform sealing lips by pushing seal completely over install tool.

Preform sealing lips by pushing seal completely over install tool.

Place seal onto the and of the install tool. Slide install tool over end of shaft and of shaft and onto sealing diameter.

 

Place seal onto the and of the install tool. Slide install tool over end of shaft and of shaft and onto sealing diameter.

 

It is also possible to make a cone on the shaft and and mount the seal without mounting tool.