Home Cosmetic Science Talk Formulating sodium hydroxide instead of ethanolamine

  • sodium hydroxide instead of ethanolamine

    Posted by ESN on February 17, 2024 at 12:11 am

    I have a question about using sodium hydroxide instead of ethanolamine in making cosmetic creams.
    I have made a cream with sodium hydroxide, but after 4 months, the viscosity has decreased a lot. Why?
    oldman20 replied 1 month, 3 weeks ago 4 Members · 5 Replies
  • 5 Replies
  • Fekher

    Member
    February 18, 2024 at 2:39 pm

    Write full formulation for better answer.

  • ESN

    Member
    February 19, 2024 at 12:46 am

    Stearic Acid 7 %

    cetyl alchol 2 %

    Petrolatum jelly 7%

    Paraffin Wax 1 %

    Paraffin L 4%

    PG 2 %

    Glycerin 3 %

    NaOH 0.2 %

  • ketchito

    Member
    February 19, 2024 at 7:41 am

    Even if you were using a 100% active NaOH, 0.2% is not nearly enough to neutralize Stearic acid so it works as an emulsifier. Check your supplier data sheet, it usually comes with a recomendación on how much of each base is enough to neutralize stearic acid.

  • Fekher

    Member
    February 19, 2024 at 3:18 pm

    Very nice answer from @ketchito

  • oldman20

    Member
    February 25, 2024 at 8:06 pm

    check your pH at first time making and current?

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