The impact strength of EFB/kenaf hybrid green composites was evaluated in relation to the existence of a coupling agent, as depicted in Figure . The incorporation of a coupling agent inside the composites results in a significant enhancement of their impact strength in comparison to the composites lacking a coupling agent. The enhancement of impact strength in EFB/kenaf hybrid green composites could be achieved through the surface modification of fibers using a coupling agent . A chemical coupling agent is one that enhances the adhesion between two substances. The utilization of a coupling agent serves to augment the adhesive interaction between the EFB fibers and kenaf fibers, as well as between these fibers and the matrix, within the context of EFB/kenaf hybrid green composites. The impact strength of the composites treated with coupling agent is illustrated in Figure . The production of more robust composites is facilitated by the enhanced adhesion between the matrix and the fibers, which is a direct result of the coupling agent. By enhanced adhesion between fibers and matrix, the coupling agent enhances the impact resistance of EFB/kenaf hybrid green composites. This enhances the stress- transfer capability of the fibers to the matrix, thereby aiding in the prevention of composite failure. Furthermore, the coupling agent has the potential to enhance the matrix's resilience. This enhances the resistance of the matrix to fracture, thereby contributing to the overall improvement of the composites' impact strength. decreasing. However, water absorption in green hybrid composites is greatly decreased by the addition of maleic anhydride (MAH) as a coupling agent. In order to adequately seal the interface and stop water intrusion, the MAH molecules make covalent connections with the active sites on the matrix as well as the hydroxyl groups on the fibers. Furthermore, coupling agents have the ability to improve the interfacial tensions and uniform fiber dispersion within the matrix by enhancing the compatibility among the fibers and matrix. This adds even more to the decreased absorption of water . With this it can be said that coupling agent modification offers a promising approach to mitigating water absorption in EFB/Kenaf fiber hybrid green composites. By improving interfacial adhesion, imparting hydrophobicity, reducing fiber swelling, and enhancing matrix compatibility, coupling agents can significantly improve the water resistance and long-term performance of these eco-friendly composites.