Equipment and Production Control

If the internal walls of the mixer are not adequately scraped during mixing and the residual material becomes part of the batch, the result may be nonuniformity. Such nonuniformity may occur, for example, if operators use handheld spatulas to scrape the walls of the mixer. 

Another mixer design concern is the presence of dead spots where quantities of the formula are stationary and not subject to mixing. Where such dead spots exist, there should be adequate procedures for recirculation or nonuse of the cream or ointment removed from the dead spots in the tank. 

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