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Films of composite materials PVC/AC were obtained through the use of a method of thermal pressing of powders of polyvinyl chloride (PVC) and activated carbon (AC) at different mass ratios. TGA, TPDIR and TPDMS methods were used to determine the concentration and study the thermal stability of oxygen-containing functional groups of AC. The morphology of AC was studied via the SEM method. When studying the microwave properties of the obtained films of PVC/AC composite materials, it was found that with an increase in the percentage mass of AC, the reflection coefficient of electromagnetic waves from the sample increases, and it appears that this change occurs according to a linear law. It was established that high concentrations of the filler worsen the radio-masking properties of the investigated PVC/AC composite while at the same time improving the absorption of electromagnetic waves by this material.