Load part A into mixing vessel. Start agitation. Mix until uniform. Load Part B into agitated mixing vessel. Mix for a minimum of 10-15 min. Load Dow Corning 531 and 536 Fluids. Mix until a uniform, water-in-oil emulsion is formed. This normally takes between 2 and 5 min. (Note: A simple procedure can be used to identify when a water-in-oil emulsion is formed. Place a few drops of the formulation into a container of water. When a water-in-oil emulsion is formed, it will not disperse in water.) After the emulsion has formed, load the solution of sodium citrate and water. (Note: Sodium citrate improves freeze-thaw stability.) Load the Tween 20. Mix until uniform. Finally process through a high-shear mixing operation (e.g., colloid mill, homogenizer, hydroshear (Gaulin Corp.), Cowles mixer, or recirculate through a high-shear auger or centrifugal pump). Final consistency will be dependent upon the shear applied to the formulation during this step. Package.
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