The effect of fiber orientation, concentration and L/D ratio on the mechanical properties of short polyester fiber-natural rubber composites have been studied. High anisotropy in the mechanical properties were observed with respect to fiber orientation. Tensile strength, tear resistance and compression set were higher in the longitudinal direction than in the transverse direction. Hardness and abrasion resistance increased and resilience decreased on increasing fiber concentration. However increasing fiber length to diameter ratio (L/D), decreased the anisotropy in tensile and tear properties at 30 phr fiber loading.
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