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.
|Materials for sealing of commonly used media||
Nitrilebutadiene rubber NBR
|Fluoric rubber FPM||Polyacrylate rubber ACM||Silicon rubber MVQ|
|Maximum admissible permanent temperature (°C) 1|
|Hypoid gear oils||80||140||125||-|
|Pressure liquids (DIN 51524)||90||150||120||-|
|Flame-retardant pressure liquids
|Oil water emulsion||50||60||-||60|
|Water oil emulsion||50||60||-||60|
* 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.