Material

As can be seen in the table below making the right choice of materials is essential in order to achieve optimum performance and prolonged life of the Shaft-Seal, because the difference between the individual materials can be huge depending on the application. In general the maximum admissible permanent temperature is decisive. It is important to know that the temperature at the sealing edge is higher than that of the medium. More information can be found in the technical information for Shaft-Seals.

MATERIAL CHOICE AT A GLANCE

Materials for sealing of commonly used media

Nitrilebutadiene rubber NBR

Fluoric rubber FPMPolyacrylate rubber ACMSilicon rubber MVQ
Maximum admissible permanent temperature (°C) 1  
Mineral lubricants        
Motor oils 100 150  125  150
Gear oils 80 150  125  130
Hypoid gear oils 80 140  125  -
ATF-oil 100 170  125  -
Pressure liquids (DIN 51524) 90 150  120  -
Flame-retardant pressure liquids
(VSMA 24317)
       
Greases 90  120  -  -
Oil water emulsion 50  60  -  60
Water oil emulsion 50  60  -  60
Anhydrous liquids -  150    -
Other media        
Fuel oil 90  -  -  -
Water 90*  100  -  -
Washing lies 90*  100  -  -

* Additional lubrication is recommended

1) Please note that due to the lubricant condition, the sealing lip geometry and of the ambient conditions, the temperature at the sealing gap
can be significantly higher than the media temperature.

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