This article presents results on selected properties, including weight, thickness, tensile strength, and structure, of moulded parts made from a polypropylene (PP) composite containing talc and a chemical blowing agent. It was shown that adding 3% by weight of the chemical blowing agent to the processed plastic reduced the moulded part weight, while a lower content (1.5%) did not significantly affect the properties studied. The structure was also analysed using a special mould insert with a variable cavity height, where the plastic flow conditions caused different shear intensities. It was shown that different zones of the moulded parts exhibited different pore counts and sizes, which resulted from different flow and solidification conditions of the plastic in the mould cavity.