Ross now offers a new design of the PowerMix (planetary disperser) for the mixing of viscous mixtures requiring a combination of slow and high-speed agitation. This new design combines two slow speed planetary stirrers with two conventional high- speed dispersers. All agitators revolve on their own axis while at the same time on a common axis. Each of the agitators is independently driven to allow for individual control of the speed. The high-speed blades provide an intensive shearing action, while the planetary stirrers continually move material into the high-speed blades. The combined action of the two planetary blades also removes material from the tank wall to insure superior heat transfer during the mixing process. The PowerMix is available from 1/2 gallon to 750 gallons working capacity.