Today, with the increase in sensitivity to nature, research on the recycling of waste and plastic materials is increasing. An important part of these studies is organic materials reinforced to polymers. In this study, the changes in the mechanical properties of composite materials obtained from different ratios of organic reinforced materials added to polypropylene matrix were investigated. The mechanical properties of composite materials produced by the reinforcement of organic materials to polypropylene polymer matrix, production techniques, effects of reinforcing elements on polypropylene matrix, reinforcement ratios added, studies on the effects of interfacial materials were examined and the findings and results obtained were evaluated.