The paper is concerned with studying magnetorheological elastomers (MRE), which are distinguished by the ability to change essentially their mechanical properties under the action of the magnetic field. Magnetosoft polymer technology has been developed and employed for manufacturing specimens having the following composition: matrix – butyl rubber BK-FM, filercarbonyl iron P-10, plasticizer –transformer oil, curing agent – glycidol (MnO2). A series of load tests were carried out to investigate the behavior of MRE specimens under quasistatic loading (creep, relaxation, tension). Figs 1 and 2 illustrate the behavior of specimens under stress relaxation and tensile stress conditions.figureFig.1. Relaxation curve of BK-FM specimen (40%Fe, 60% ТМ) subject to periodically applied 1 or 2 T magnetic field. Application of the magnetic field leads to an essential increase in the stresses, which is supported by the occurrence of the magnetostriction effect manifesting itself in a decrease of specimen dimensions (contraction).figureFig.2. Extension of BK-FM specimen (40%Fe, 60% ТМ) subject to periodically applied 1,2 T magnetic field. The stresses in the material under tensile load increase rather slowly. The revealed effect can be used in different servomechanisms, for example, in gages and valves.