Home Cosmetic Science Talk Formulating Can O/W Emulsifier produce a W/O product?

  • Can O/W Emulsifier produce a W/O product?

    Posted by HenryLee on November 21, 2024 at 2:00 am

    Dear Sir,

    I would like to get some advise as the subject. Recently I try to formulate a mineral sunscreen cream SPF 50 using a cold process O/W emulsifier. However, after finished, I try to make 10% solution to test pH and found out that the cream doesn’t dissolved in water as O/W cream behaviour.

    My formula ingredients as below:

    Water 50%; Glycerin 2%;

    Cold process emulsifier (Sodium Acrylate/sodium Acryloyl Dimethyl Taurate Copolymer, Cetyl Alcohol, Glycol Stearate, Glyceryl Stearate, Caprylic/capric Triglyceride) 4%

    TIO2 Dispersion (C13-15 Alkane based) 20%

    ZnO Dispersion (C13-15 Alkane based) 15%

    Natural oil (Argan Oil + Tocopherol) 5%

    Sorbitan Oleate 1%

    Phenyethanol Blend 1%

    Water-based film former (Acrylates/Ethylhexyl Acrylate Copolymer (And) Water (And) Aminomethyl Propanol) - 1%

    Silica - 1%

    Appreciated if can giving advise on this and what is the mechanism on this shift.

    Thank you

    amr replied 5 days, 22 hours ago 3 Members · 3 Replies
  • 3 Replies
  • ketchito

    Member
    November 21, 2024 at 6:38 am

    Could you be a bit more specific about the solubility test? Keep in mind that ZnO, TiO2 and silica are not water soluble.

  • HenryLee

    Member
    November 25, 2024 at 12:13 am

    Dear Ketchito,

    Previous practice when I make a O/W emulsion, I would check the product pH. Then, I will take 10% of the product and mix in 90% DH20 to check for product pH. The solution purpose is check for the product pH. My concern is, it is possible that I use O/W emulsifier, and the product come out with W/O emulsion.

  • amr

    Member
    November 27, 2024 at 7:37 pm

    it will probably separate as stability accelerates

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