<![CDATA[This study aims to investigate the fabrication process, the mechanical strength characteristics, and the effect of fiber volume fraction variations on the mechanical and physical properties of the composites. The fabrication method was hand lay-up with coconut coir fiber-to-resin ratios of 10:90, 20:80, and 30:70. The process included fiber preparation (cleaning, alkalization, and drying), mixing the resin and catalyst at a 2:1 ratio, plate molding, and curing for 24 hours. Specimens were cut per ASTM D790 for flexural testing, ASTM D256 for impact testing, and prepared for friction coefficient evaluation. The results demonstrated that the variation in fiber fractions significantly influenced the mechanical and tribological properties of the composites. The results demonstrated that the variation in fiber fractions significantly influenced the mechanical and tribological properties of the composites. The 10:90 coconut coir fiber-epoxy resin composition yielded a flexural strength of 21.33 MPa, an impact energy of 0.018 J/mm², and static and kinetic friction coefficients of 0.39 and 0.38, respectively. Meanwhile, the 20:80 composition showed a flexural strength of 39.72 MPa, an impact energy of 0.031 J/mm², and static and kinetic friction coefficients of 0.48 and 0.45, respectively. The 30:70 variation showed a flexural strength of 30.10 MPa, an impact energy of 0.031 J/mm², and static and kinetic friction coefficients of 0.57 and 0.54, respectively. Overall, the 20:80 coconut coir fiber-to-epoxy resin variation was considered the most optimal composition, as it provided the best balance among flexural strength, impact resistance, and friction coefficients.]]>
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