Home Cosmetic Science Talk Formulating Stearic Acid

  • Stearic Acid

    Posted by Lily7 on September 8, 2016 at 8:07 pm

    Hello, people!

    Can I mix Stearic Acid with cationic surfactants?
    I’m trying to mix it with Cetrimonium Chloride, but the phases don’t mix this way! They just mix when I add amphoteric surfactant, like betaine.

    The problem is that I don’t want to use amphoteric surfactants in my formula (hair mask).

    What could I do to use Stearic Acid to create an emulsion together with Cetearyl Alcohol, without using amphoteric or anionic surfactants?


    johnb replied 7 years, 7 months ago 2 Members · 1 Reply
  • 1 Reply
  • johnb

    September 9, 2016 at 8:51 am

    Cetrimonium chloride will dissolve in stearic acid (and cetearyl alcohol) by using solid CTC and mixing with molten SA and/or CA and allowing to dissolve. Heat the SA/CA to 100 - 110C and stir in the CTC. Stir to dissolve and pour into a mould or on to a cool surface to solidify.

    You must use a good grade of CTC as some poorer grades may contain sodium chloride as a contaminant which will not dissolve.

    As a point of interest, cetrimonium bromide 10% in cetearyl alcohol equates to the pharmaceutical material Cationic Emulsifying Wax.

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