W/O MAKE UP FOUNDATION PROBLEMS WITH STABILITY
Hi, novel formulator here!
I am currently involved in a liquid W/O foundation project where we are looking for a fluid texture with matte finish intended for acne-prone skin, and preferably without silicones.
My current problem is I do not have a micronizer in the lab and I am being asked for a formula that passes without separation (not even minimal) a centrifuge test of 4000 rpm for 2 hours. The client wants the formula to pass the Lumisizer test.
Our best bet has been a formula containing sepimax zen in the water phase and Easynov + isolan gi 34 on the oil phase, but it still gets a little separation…
I have been searching and observing similar formulas available at the drugstore and I was surprised to find that most of them are already separated in store. So I am starting to think this might be a usual phenomenon?
I would really appreciate it if someone could give me some advice on stability testing and formulation of this kind of products.
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