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Mechanical failure of zeolite-HDPE material applied to skull bone implants is a material fracture that cannot be controlled. An important step to minimize failure due to fracture is to understand the fracture characteristics indicated by the propagation path pattern. This study aims to investigate the fracture propagation pathways in quasi-static conditions. Injection-molded zeolite-HDPE composites were placed in an environment of ultraviolet (UV) radiation for 200 hours at atmospheric pressure. UV-irradiated Double-edge cracked zeolite-HDPE composite was tested in mode I in a universal testing machine (UTM) with a crosshead speed of 2 mm/min at a constant room temperature of approximately 25oC. The stress and elongation were registered by the UTM. During loading, the evolution of cracks in the ligament length region was recorded with the camera so that the crack propagation pathway until the total fracture occurs can be clearly observed. The results show that the crack propagation pathways pattern were not all straight and parallel to the ligament length. They are also found in a deviant state of the ligament length line by forming an angle &