 The use of natural fibers such as hemp to reinforce plastics is a promising practice due to its environmental benefits. This paper explores the use of recycled high-density polyethylene, RHDPE, with hemp fibers to create composite materials that are more sustainable alternatives to traditional wood slash plastic composites. The authors found that the addition of hemp fibers significantly improved the strength and stiffness of the material, while also increasing its antioxidant properties. Furthermore, the addition of hemp fibers resulted in a significant reduction in the amount of time required for the material to degrade. Overall, this study shows that hemp fibers can be used to create environmentally friendly composite materials that are stronger and more durable than their counterparts made from traditional plastics. This article was authored by Eleftherias Anthopolu, Ioleana Crisoffi, Prodromos Polychronidis, and others.