This study highlights the mechanical and morphological development of hybrid polypropylene (PP) composites combining animal natural fibers and glass fibers, aiming to harness the advantages of both materials-such as the sustainability and cost-effectiveness of natural fibers alongside the high mechanical properties and stability of synthetic fibers-while mitigating their individual limitations. To identify the optimal fiber composition and minimize experimental runs, the Taguchi method was applied using three factors: type of animal fiber (goat hair, sheep wool, and camel wool), animal fiber content (3, 6, 9 wt.%), and GF content (0, 2, 4 wt.%). Results showed that the percentage of animal fibers was the most influential parameter for ultimate tensile strength and Young’s modulus. Goat hair exhibited the highest ultimate tensile strength due to its low curvature, while camel wool contributed most to Young’s modulus owing to its fine diameter. Camel wool also provided the best impact strength, likely due to its small fiber diameter and higher specific surface area. SEM analysis confirmed that fiber-matrix interfacial bonding was significantly affected by fiber morphology and orientation. This study highlights the potential applications of hybrid polymer composites reinforced with both natural and synthetic fibers.
