Elastomeric blends based on SBR and NBR have been prepared, giving emphasis to differences in blend composition. It was observed from dynamic mechanical analysis that the SBR-NBR blends can be compatibilised by addition of 5 pphr dichlorocarbene modified styrene/butadiene rubber. The efficiency of carbon black in uncompatibilised and compatibilised blends was evaluated with rerefence to their processing characteristics and technological properties and the resistance of the vulcanisates towards thermal and oil aging with analysed. The changes in technological properties have been correlated with variations in crosslink density estimated from stress-strain and swelling behaviour. The swelling studies are also extended to evaluate the reinforcing nature of the filler. The results of the study reveal that compatibilised blends show enhanced mechanical properties in the presence of HAF carbon black in comparison with uncompatibilised samples.