The optimal process conditions for thermo-chemical de-vulcanization of carbon black filled SBR were investigated in this study, and influences of carbon black type and loading on de-vulcanization efficiency were studied by correlating sol fraction and crosslink density. Increased carbon black loadings result in rising crosslink density due to more recombination of active chain fragments. However, carbon black particle size - N-330 and N-550 - had no observable effect on the de-vulcanization efficiency. The de-vulcanization process of carbon black filled SBR was optimized by adjusting two factors: de-vulcanization temperature and time. It was observed that lower de-vulcanization temperatures lead to a more efficient de-vulcanization with increasing time. At higher temperatures, more recombination occurs.