SKF - Industrial Shaft Seals

Chemical and thermal
resistance
The most important factor when selecting the
appropriate elastomer for a radial shaft seal is
its chemical resistance to the medium to be
sealed or excluded. The operating temperature
is another important factor. Heat accelerates
ageing of the elastomer and increases the reactiv
ity and aggressiveness of the sealed
medium.
Radial shaft seals are mainly used to seal
lubricating oils and greases as well as hydraulic
fluids (including non-flammable fluids). Guideline
values are provided in table 4 on page 68
for the permissible operating temperatures, i.e.
temperatures at which the SKF seals are still
chemically resistant. The temperature range
stated for a group of media means that the sealing
material is resistant when continuously oper
ated within this particular range.
The N means that, within the group, there
are some media that are compatible with the
elastomer, but also some that have a detrimen tal
effect on the elastomer.
The n means that the seal material is not
resistant to media belonging to this group.
For the resistance of seal materials to media
not listed in table 4 on page 68, refer to the
section Chemical resistance († page 35) or
contact SKF.
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