Using Water-Soluble Sunscreen in Water-in-Oil Formula
Question
Can Terephthalylidene dicamphor sulfonic acid (Na-Ecamsule), a water-soluble sunscreen active, be incorporated into a Water-in-Oil formulation, specifically when using Water-in-Oil EZ as the emulsifier?
Answer
Yes, Terephthalylidene dicamphor sulfonic acid (Na-Ecamsule eq. Mexoryl SX) can be used in a Water-in-Oil formulation with Water-in-Oil EZ.
Na-Ecamsule is a water-soluble sunscreen ingredient. In a Water-in-Oil emulsion, the water-soluble ingredients are dissolved in the internal water phase. The Water-in-Oil EZ emulsifier is designed to bind this water phase within the external oil phase.
To incorporate Na-Ecamsule into a Water-in-Oil formula using Water-in-Oil EZ, you should dissolve the Na-Ecamsule in the water phase first (heating to 60 degrees Celsius can help with dissolution as per the product description). Then, gradually add this water phase to the oil phase containing the Water-in-Oil EZ while stirring or blending continuously, following the recommended mixing steps for Water-in-Oil EZ.
Water-in-Oil EZ is suitable for sunscreen formulations, as mentioned in its product description.
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