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The article presents experimental results of changes in the dielectric and mechanical characteristics of spheroplastics based on an organosilicon elastomer and metallized glass microspheres caused by static and shock compression. Two regions of the frequency dispersion of the dielectric constant are established that are associated with the metal coating of microspheres. It was found that both the low- and high-frequency dispersions of the complex dielectric constant decrease sharply at a relative compressive strain of no less than 70%. Possible causes of the detected change in the complex permittivity are discussed.