Please be more specific.

Reinhard H. Wohlbier ■

It is a fluid which is held in place by a magnetic field. Applications include providing a gas tight seal on a high vacuum rotating machine shaft.

Again though your question is very vague, I would suggest you search on the net and come back with any specific questions, although I am not sure that this forum is the best place to get them answered. It isn't really a bulk handling question. ■