One factor of the utmost importance regarding the actual implementation of magnetorheological devices is the longevity and stability of the MR fluid. Until recently,these issues have been major obstacles to real-world applications of MR fluids. Inearly MR compounds, the ferrous particles tended to detach from the carrier fluidthus producing a non-homogeneous material without the desired properties. The useof additives has greatly overcome this problem and presently the iron particles inMR fluids will only separate from the fluid after long periods of inactivity (severalmonths)5and, most importantly, moderate mixing is enough to return the MR fluidto its original properties.
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