![]() ![]() Quite in contrast to O/W emulsions, W/O emulsions need an electrolyte to stabilize the water phase 8or to be exact the micelles). For most emulsifiers, the oil phase is around 20-35% and the water phase is between 65-80%. The emulsifier will dictate the content of the water phase and the oil phase. This means, to make a W/O emulsion you need a W/O emulsifier. The nature of the emulsion is defined by its emulsifier. They still need a preservative system but preserving W/O emulsions is not as tricky as O/W emulsions. This means a longer hydration compared to O/W formulationsĢ- Since sensitive hydrophilic ingredients are hidden inside the oil phase, they remain stable over a longer period.ģ- And again since the water phase is hidden inside the oil phase, W/O emulsions are less susceptible to contamination compared to O/W emulsions. In W/O emulsions, because the water phase is hidden inside the oil phase:ġ- The water and hydrophilic ingredients are gradually released to the skin. Just imagine what happens when you try to rinse off a W/O shower cream or hair conditioner!!!! The only exception when you shall not make a W/O emulsion is when the product is supposed to be rinsed off. You may prepare a whole range of face to toe products with W/O emulsions. Night care, skin care for extremely dry and sensitive skin, products for those suffering under eczema and skin care for dry, cold and windy climate are best formulated in a W/O concept. Another example is water-proof makeup but these are not the only possibilities. The most common uses for water in oil products are sun care and baby bottom care. This leads to a water resistency and this means that the product is not easily rinsed away. In water in oil emulsions, as the name reveals, the water phase is the inner phase and the oil phase is the outer phase. Many moons ago, we demonstrated the main differences between the water in oil (W/O) and oil in water (O/W) emulsions in this short video. ![]() The fundamental differences between a water in oil and an oil in water emulsion The scapegoat of water in oil emulsions it the sticky and unpleasant suncare products my generation and the generation before me has in mind but the possibilities, the ingredients and the products have changed so dramatically during the last decade that very often, you even don't realize you are using a water in oil emulsion. Water in oil emulsions are quite intimidating for some new formulators and students but once you crack the code and create the first couple of stable W/O emulsions you will add them as a constant member to your repertoire. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |