The mechanical properties of rubber can be greatly altered by addition of fillers, carbon black. Most important reason for its use is its ability to enhance the final properties of rubber vulcanizates. Fillers when added to polymer systems causes considerable changes in dynamic properties, not only the dynamic modulus, both viscous modulus and elastic modulus, but also their ratio, i.e., loss factor, which is related to the portion of the energy dissipated during dynamic deformation.In practice, the energy loss in rubber products during dynamic strain is of great importance, for example, in vibration mounts and tires. Energy loss acts as the service performance predictor of these products regarding heat generation and fatigue life for the vibration mounts and rolling resistance, traction, and skid resistance for the tires. When rubber is deformed an energy input is involved which is released in part when the rubber returns to its original shape. The part which is not returned as mechanical energy is dissipated as heat. In the present study optimized test conditions to ascertain heat build – up (HBU), Tanδ, hysteresis under constant energy input, obtained from Premier TM RPA has been correlated with Goodrich Flexometer (ASTM D623) ΔT and well –established laboratory methods to determine energy dissipation (hysteresis).