Mixing Procedure for Cream Formulation with Satin Mousse
Question
I have the following formulation and would like to know if I can mix it like a 'light cream maker':
- Water: 75.4%
- Disodium EDTA: 0.1%
- Lipid soft cc: 20%
- Oxybenzone: 3%
- Satin mousse: 1%
- Eye preserved: 0.5%
The details for Satin Mousse state that it should be mixed with water first before adding the oil phase.
My concern is that if I mix Lipid soft cc and Oxybenzone in one beaker and then add it to the beaker containing the water + Satin mousse mixture later, the proportion of ingredients might be inaccurate due to residue left in the original beaker.
Answer
Based on the ingredients and your note about Satin Mousse, the mixing procedure is similar to making a cream, but you should follow the specific instructions for Satin Mousse.
Here is a suggested procedure:
- Water Phase: Combine Water, Disodium EDTA, and Eye Preserved in one beaker. Add Satin Mousse to this water phase and mix well until it is fully dispersed and/or the mixture thickens according to the Satin Mousse instructions. You may need to heat this phase if required by the Satin Mousse instructions or if you plan to heat the oil phase.
- Oil Phase: In a separate beaker, combine Lipid Soft CC and Oxybenzone. Mix them together. You may need to gently heat this phase to help dissolve the Oxybenzone if necessary, and if you heated the water phase, heat this phase to a similar temperature.
- Combine Phases: Slowly add the Oil Phase to the Water Phase while continuously stirring. Stir until the mixture emulsifies and a cream forms. Continue stirring occasionally while the cream cools down.
Regarding your concern about ingredient loss when premixing the oil phase: It is standard practice in cosmetic formulation to prepare the oil phase separately. While a very small amount might remain in the beaker, it is generally negligible in typical batch sizes and is accounted for in standard formulation tolerances. The benefit of ensuring the oil-soluble ingredients are properly mixed in the oil phase before combining with the water phase is important for emulsion stability.
So, while it's not exactly like some simple "one-pot" cream makers, following the separate phase preparation and then combining is the correct approach for this type of formulation, especially given the specific instructions for Satin Mousse.