Recently, interest in the effect of static magnetic fields on polymers is motivated not only by scientific considerations, but also by applications to their technology of production. A steady magnetic field is known to have a considerable influence of the deformation properties of polymers and composites based on them, although, more of them are diamagnetic materials. The effect of magnetic fields on organic materials is based on Cotton–Mouton effect, which define a role of the relaxation spectrum, and motivate also creation of the magnetic moments at the influence of external field of force. They occurs in the polymer deformation process when molecular chains are missing and free radicals arise. Consequently, the structure defects are possible, which contribute appearance of the nanogaps and microgaps.