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We investigate composite materials synthesized by hot pressing from mechanoprecursors based on ultra-high molecular weight polyethylene (UHMWPE) and magnesium ferrite particles of different dispersion and concentration. Structural characteristics have been studied by scanning electron microscopy, X-ray diffraction. Dielectric properties were analysed testing frequency dependence of dielectric permittivity, dielectric loss and conductivity. The effect of the size and concentration of ferrite particles on the composite dielectric properties have been established.