When hemicellulose breaks down at about 250°C, the second step takes place. The third step occurs at around 350°C and is due to the degradation of cellulose and lignin . The TGA thermogram for the EFB/kenaf hybrid composites with coupling agent shows a similar three-step degradation process. However, the temperatures at which the degradation steps occur are slightly higher for the composites with coupling agent. This means that coupling agent has made composites more stable at high temperatures. Additionally, the TGA thermograms reveal that at 800°C, the composites with coupling agent have a sophisticated residual weight than the composites without coupling agent. This suggests that the coupling agent has decreased the char formation of the composites . and. By applying a coupling agent to the fiber surface, EFB/kenaf green hybrid composites are capable of higher tensile characteristics and tensile modulus . A coupling agent refers to a chemical compound that enhances the adhesion properties between two distinct materials. In the context of EFB/kenaf hybrid green composites, the utilization of a coupling agent serves to enhance the interfacial bond among the EFB fibers and the kenaf fibers, as well as among fibers and matrix materials.