Nitrogen adsorption and macromolecular adsorption show that there are more micropores on the surface of the experimental carbon black. We have studied the effect of micropores of black on reinforcement in NR (Natural Rubber)

BR (Butadiene Rubber) and SBR (Styrene-Butadiene Rubber) by measuring tensile resistance of black filled Vulcanizates. It has been found that under same conditions the bond strength between NR or BR and the experimental black was weaker. This phenomenon is probably due to poreinduced cavity. The effect of roughness of black on tensile resistance of black filled SBR vulcanizate differs from that of NR and BR vulcanizates

because it has different relaxation characteristics.