Data is shown confirming that the new inversion carbon black types can result in compounds closely matching those based on high dispersion silica. However, the data shows that the compounds may be difficult to mix and process unless special additives are used. A number of Struktol products are shown to have considerable influence on the processability of these compounds without detracting from their performance properties. They greatly reduce the black incorporation time, improve carbon black dispersion, improve the mill handling and considerably improve the processability.