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Large number of studies have been carried out and references are available on the use of synthetic rubber with non-carbon black fillers. Use of carbon black reinforced natural rubber is very common in automotive applications especially suspension top cups, cab mounts, suspension bushes, engine mounts etc Carbon black plays key role in the alteration of the rubber compound properties to suit the end product requirements for hysteresis, stiffness, hardness, compression set etc. This paper gives experimental details, results, and conclusions on and effect of carbon black in natural rubber compound. Carbon black reinforced natural rubber formulations were made and keeping all other ingredients of the formulation constant including type of carbon black and by varying only the amount of carbon black dosage. Since the rubber components call for different specifications based on the end product requirements, it is not possible to have common rubber formulation for all the end products.