The present investigation aims to investigate the physico-mechanical properties of waste filler-polypropylene composites concerning the compatibilizer concentrations and the industrial waste filler mixing ratio. Three different levels of coupling agent concentration and four different waste filler to polypropylene mixing ratios were used in the experiment to examine the composite's physico-mechanical characteristics. The expected result was that while the melt flow index decreased, the composite density increased as waste filler content did. The addition of waste filler enhanced the thickness swelling of composites slightly when compared to control specimens. The tensile properties of composites significantly improved as the mixture's filler content rose. Specifically, the tensile modulus rose as the amount of filler rose. Similar trends were seen in flexural strength and modulus as well as tensile properties. The notched and unnotched Izod impact strength is decreased by the inclusion of filler. The tensile and flexural properties of the coupling agent-added specimens were much better than those of the control specimens (without any coupling agent). The coupling agent's large molecular weight significantly enhanced the composites' tensile and flexural properties. Overall, the findings point to the possibility of using industrial waste as a practical filler to add reinforcement to polypropylene composites.
