With the use of mechanical seals or packing seal the centrifugal pump, compared to magnetic pump has the following advantages.

High Reliability: The seal contains a simple, permanent magnetic structure and a non-wearing magnetic fluid. The only parts subject to mechanical wear are self-contained ball bearings.

For the disadvantage of mechanical seal and stuffing seal used widely in kneader, a magnetic fluid seal structure was designed for kneaders which are often with bulky shaft and high rotation speed.