The information provided here may not reflect the requirement of current specifications and is provided here for general education purposes only.
Lipophilic emulsifiers are miscible with penetrants in all concentrations.
However, if the concentration of penetrant contamination in the emulsifier becomes to great, the mixture will not function effectively as a remover. AMS 2644 requires that lipophilic emulsifiers be capable of twenty percent penetrant contamination without a reduction in performance. AMS 2647A requires the emulsifier to be replaced when its cleaning action is less than that of new material. Since lipophilic emulsifiers are oil-based, they have a limited tolerance for water. When the tolerance level is reached, the emulsifier starts to thicken and will eventually form a gel as more water is added.