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Despite the fact that the basic HLB system has been around for about fifty years, the ability to predict the performance of specific emulsifiers in the preparation of emulsions remains a challenge to the formulator. The HLB system works best in predicting emulsification for alcohol ethoxylate that is surfactants based upon fatty alcohols that have been modified by reaction with ethylene oxide. The system is also most useful for emulsions in which water is a component.
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