Need help with emulsion sedimentation problem
I am having some trouble with my skin cream. The end product appears and applies well, however when I place it in a test tube and leave it for a couple of hours it begins to form a runny layer of yellow oil on the top. I tried reducing the concentration of oils but this did not resolve the problem.
Water phase constitutes distilled water about 73%
Emulsifiers 4% (peg-40 hydrogenated castor oil, ppg-26-buteth-26, sorbeth-30)
Emollients 8% (plant oils)
Thickener 1.2% (carbomer)
I have been adding neutralized carbomer after emulsion. I will try to add it into my water phase or right at the start of emulsion instead to see if that helps.
Also I am currently making small samples about 50grams and manually stirring with a rod instead of using a homogenizer.
I heat both the water and oil phases to 70 degrees celsius before combining them.
Over time my cream seems to be melting and disintegrating instead of keeping its form. Any tips?
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