Influence of the hydrophilic-lipophilic balance of sunscreen emulsions on their water resistance property.

The use of sunscreens with sun protective cloths is the photoprotection way mostly used by Occidentals. During sweating or a bath, those products should be still efficient. As the emulsion is the mostly used type of product format, it is essential that the scientist knows how to formulate an emulsion which will be water resistant. The HLB (hydrophilic-lipophilic balance) of a formulation has high influence on this characteristic.