When SBS mixing with oil, if a kind of aromatic components increases, the absorption rate becomes larger. Oil has a great influence on the dispersibility of carbon black, and the degree of dispersion of the carbon black will affect the vulcanizates flex. If you add the amount of the excess oil, then the poor dispersion of carbon black. With aromatic (aromatic oil) once mixing a good dispersion can be obtained, but the naphthenic oil and paraffinic oil must enjoy repeatedly kneaded.