In general, as the amount of waste-derived filler in the composite increased above 5 phr and the amount of carbon black in the composites decreased below 30 phr, tensile strength, 300% modulus and hardness decreased while elongation at break increased (Fig. 3). However, the mechanical properties of unfilled vulcanized GNR were considerably improved with the incorporation of the different waste-derived fillers alone (Fig. 4). All the composites made with 35 phr of waste-derived fillers (no carbon black), except those made with 35 phr of macro sized TP and GB, had significantly higher tensile strength than unfilled vulcanized rubber (7.07 ± 0.41 MPa). Furthermore, composites manufactured with 35 phr of micro sized GB and ES presented significantly higher values of 300% modulus, while significantly higher values of hardness were obtained for composites containing 35 phr of micro sized GB.