What is Carbon Black? Carbon Black powder is a material that is a by product of the combustion of heavy petroleum powders. Carbon Black material is sometimes used in the batteries to replace the use of graphite as the anode material in the product. Carbon black for battery materials needs to be sized to a very tight range in order to function at its full potential inside of the battery cell. Sieving carbon black is a difficult process due to the low density of the product and lack of flow-ability. To sieve carbon black efficiently, energy on the screen is needed to keep the material from blinding the screen and overwhelming the screen mesh.