|Axial shaft seal with external sealing lip, for use with grease. At low peripheral speeds and very good – if possible, lapped – mating surfaces, it can also be used with liquids. This seal can be employed in either a stationery or rotating manner. For use with liquids, the maximum permissible speed must be reduced to 1/3 of the figure indicated in the table. By increasing the spring force, it is possible to raise the medium pressure by up to 50%, however this can result in greater friction and heat-up, and consequently in faster wear.