The double planetary mixer (DPM) is often used for the mixing of high viscosity materials up to approximately 6-million centipoise (cps). The DPM contains two mixing blades that revolve on their own axis, as well as on a common axis, within the mix vessel. The mix pattern ensures that all materials in the vessel are intermixed within a few minutes and that ingredients are not damaged during mixing. This company has recently completed three identical DPMs for the continuous processing of a specialty chemical product. The units shown (photo) include: vacuum construction; special addition ports; jacketed mix cans on casters for heating and cooling; thermocouples to monitor temperature; stainless-steel construction; manually operated flush discharge valves; and variable speed drives — Charles Ross and Son Co., Hauppauge, N.Y.