The paper presents the results of selected properties, including weight, impact strength, and tensile strength, of moulded parts made of polypropylene (PP) composite containing talc and a chemical blowing agent. It was shown that adding 1% of chemical blowing agent to the processed plastic leads to a reduction in part weight, whereas a higher content (2%) does not significantly affect the tested properties. The study also investigated the structure using a special mould insert with a variable cavity height, in which the flow conditions of the plastic cause different shear intensity. It was demonstrated that various zones of the moulded parts exhibit different number and size of pores, which results from different flow conditions and solidification of the plastic within the mould cavity.