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We present the results of investigation of the behavior of mechanical and various physical characteristics of polypropylene with and without three types of fillers produced in Poland depending on the type of heat treatment. It is shown that if the content of the carbon-black filler is as high as 10%, then the composite behaves as a conductor. Thermal treatment improves all mechanical properties of materials except fracture toughness. This is also partially explained by changes in the crystal lattice.