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Each varying parameter which can contribute to the quality of received applications plays an important role in the processing of polymer materials. The influence of mold temperature on the molded parts’ properties and density was investigated during the optimization of injection molding process parameters of polyamide-6 (PA-6) as well as polyamide-6/montmorillonite (PA-6/MMT) composites. The hardness and Izod notched impact strength were determined for the obtained PA-6-based materials.