The purpose of the research was to determine the aging-induced changes in the selected mechanical properties
and flammability of polypropylene modified with natural fillers (sunflower husk, wheat bran, pine sawdust and
talc). The fillers were introduced into polypropylene in a mechanical mixing process (weight content 20%). The
samples were obtained with the use of an Allrounder 320 C500–170 laboratory injection molding machine. The aging process under artificial sample conditions was carried out in the laboratory chamber (aging time of 0, 60, 120,
240, 360 hours). The tests of the mechanical properties included the measurements of hardness, impact strength
and tensile strength. The flammability tests were carried out with a vertical and horizontal alignment of the sample
according to the PN-EN 60695–11–10 standard. As a result of the research, a significant impact of the introduction
of natural fillers in the form of sunflower husks, wheat bran and pine sawdust on the selected properties of polypropylene was demonstrated. A large decrease in the impact toughness, a relatively small decrease in the short-term
tensile strength as well as an increase in the elastic modulus and stress at rupture caused by the introduction of the
natural fillers mentioned, were found. A beneficial effect was the relatively small impact of aging on the mechanical properties and flammability of the modified polypropylene fillers.
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