The research focuses on 40 wt % hemp reinforced polyethylene (LLDPE) aged composite surface properties. The increased use of natural components-reinforced composites in an outdoor environment has led to questions concerning the environmental durability of these materials. As a reinforcing component chemically modified hemp first processing waste was used. The waste was treated with alkali, silanized and the surface was modified with a sol-gel method. For some composites the additives have been added during the manufacturing process. UV ageing was performed according to the standard ASTM G154. UV radiation has a crucial influence on the physical properties and visual changes of the polyethylene matrix. The composite samples have become brighter and micro-hardness has decreased, cracks and cavities on the surface of the composite were observed after ageing.