High shear stress and energy breaking down the agglomerates to their finest particle size and homogenizing them throughout the rubber matrix A well dispersed mixture has a lower more uniform viscosity than a less homogeneous mixtureAdding high viscosity polymer first enhances the dispersionViscosity changes significantly with temperatureAn increase of 20 C can halve the viscosity. Since shear stress is lower at lower viscosity's, dispersive mixing is slower at higher temperatures.