A UDIF (Up-Down Interference Flow) impeller could work for up to 8,000 cp, although impeller type is not the only factor.  The rotational speed, impeller diameter, tank diameter, and process requirements are also factors.  Emulsion polymerization is difficult to predict as a category of processing, since surfactant, temperature, and other chemistry all interact and affect the process.  The UDIF impeller is not a wrong answer, but the impeller type is not the only factor affecting emulsion polymerization.

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