Sealing Element

Type of Seal Storage Fitting A Seal
It must first be decided whether the sealing element is to be synthetic rubber or leather. Many factors determine this e.g. media to be sealed, temperature, shaft speeds and surface finish etc, all these factors must be carefully considered.

This depends on four main factors: - Temperature, Fluid, Pressure, Speed


Seals should be stored at room temperature in a clean and dry atmosphere. They should be kept in the protective paper in which they are received until they are ready for assembly. This involves checking and preparing the shaft for optimal performance.
Generally leather elements would be more used for more arduous applications having moderate shaft speeds, pressures and temperatures of -30 degrees C to +90 degrees C (13 degrees F to + 194 degrees F). Synthetic rubber (nitrile) seals will accommodate temperatures of .-25 degrees C to + I 20 degrees C (-I3 degrees F to +248 degrees F) and, by the very nature of their design, greater surface speeds and pressures.

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If the natural moisture found in leather dries out during storage and the element becomes hard, you will restore the flexibility by soaking them in warm oil at 25/30. C (77/86 F) for not less than 15 minutes. Before commencing this operation, however, the source of heat must be removed. Do not throw seals into bins, stack them in irregular piles or tie them up with string or wire. Treat them for what they are - an important engineering component.

  1. Check the housing, shaft and seal are clean of any foreign matter. As however small, dirt can have an adverse effect on sealing performance.




With sophisticated rubber we are able to increase the temperature range quite considerably i.e. silicone rubber -60 degrees  C to +200 degrees C (-16 degrees  F to +392 degrees F) and fluoroelastamer -15 degrees  C to + 250 degrees C (+5 degrees F to +482 degrees F). It must be stressed that these are a guide only,  and must be used with  your application details before final selection is made. Autospin would be pleased to offer advice on the correct materials, should the need arise.    
  1. Having satisfied yourself in this respect, apply a thin film of general-purpose grease to the sealing element to assist assembly. This is imperative in the case of synthetic rubber Dual/Triple seals as they need to have the cavity between the lips pre-packed with grease, as there is a danger that one of the lips may not receive adequate lubrication under working conditions.


Information Regarding Housing / Shaft Assembly and Maintenance

Copyright Autospin (Oil Seals) Ltd.2004.