<![CDATA[Using sugarcane fiber waste as composite reinforcement can reduce reliance on synthetic fibers, but performance depends strongly on fiber wetting, interfacial bonding, and matrix fraction. This study characterized sugarcane fiber-epoxy composites to determine the effects of three compositions on impact toughness and flexural strength. The fibers were treated with 5% NaOH for 4 h, oven-dried at 50°C for 12 h, aligned at 0°, and fabricated by hand lay-up using fiber-to-epoxy ratios of 50:50, 45:55, and 40:60. Each variation was tested in triplicate according to ASTM D6110 and ASTM D790. Data are reported as mean ± standard deviation and were explored using one-way ANOVA. The 40:60 composition produced the highest impact toughness (0.208 ± 0.003 J/mm²) and flexural strength (17.24 ± 0.75 MPa). Composition significantly affected impact (p = 0.0075) and flexural performance (p = 0.0005. The results indicate that a higher epoxy fraction improves fiber wetting and matrix continuity; however, interface optimization and void reduction are still required before the material can be used for highly loaded structural components.]]>
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