The influence of ageing caused by heating on nanocomposites prepared by co-coagulation of natural rubber latex and Cel xanthate mixtures was studied in this work. For comparison purposes, carbon black natural rubber vulcanizates were also prepared. The amount of Cel II (Cel II)varied from 0 to 30 phr, while carbon black from 0 to 35 phr. The different composites were analyzed as for crosslink density, dynamic and mechanical properties, before and after ageing.