The effect of the addition of high abrasion furnace (HAF) black on the dielectric properties of poly (ethylene-propylene-diene monomer) EPDM, polyethylene (PE) blend using both sulphur and peroxide vulcanizing systems was studied. It was observed that the increase in the permittivity is more pronounced with HAF black in the case of sulphur system than for the peroxide one. Many theories have been tested to calculate the effective permittivity of these particulate blends. The observed values of the permittivities are in close agreement with those calculated by Tsangaris's model, taking into account the variation of the aspect ratio (a/b) of the HAF black with the volume fraction of the HAF black in the matrix and type of the vulcanizing system.