At similar concentrations of palm oil fatty acid, natural rubber compounds with 50 phr of carbon black show highest maximum and minimum elastic torques, viscous torque and tan delta, followed by compounds with 30 and 15 phr of carbon black. Reversion decreased with increasing palm oil fatty acid concentration, whereas fatigue life shows an increasing trend. At similar acid concentrations, natural rubber compounds with 50 phr of carbon black show the lowest reversion and fatigue life.