Home Cosmetic Science Talk Formulating Issues with stability of an acidic solution

  • Issues with stability of an acidic solution

    Posted by Anonymous on November 14, 2018 at 10:42 pm

    Hi to all !

    I am having issues maintain stability for an acidic formula. I am suing the traditional hydroxucellulose and cetearyl alcohol ceteareth -2o . After formulating the formula looks fine- though after a week it starts to loose its viscosity and thickness.

    I usually don’t heat up he cellulose to 75 degrees- is it criticall?
    Should I increase the water phase acidity pre to additng the active acid ingredient?

    PLEASE Help me out. I am lacking the knowledge to solve this by myself.

    chemicalmatt replied 5 years, 7 months ago 2 Members · 3 Replies
  • 3 Replies
  • ChrisV

    Member
    November 15, 2018 at 7:00 am

    Hi Keren! pH of the formula? And maybe acidity of the mixture? I usually go with xanthan gum at acidic media.

  • Anonymous

    Guest
    November 15, 2018 at 7:40 am

    round 2 . Thanks for your replay…

  • chemicalmatt

    Member
    November 16, 2018 at 7:54 pm

    If you are using HEC, and not heating, then it is wise to allow 60 minutes mixing time, then add a TINY bit of alkali (AMP-95, NaOH 1.0%, ) to swell. Then proceed as usual. However, if you have a LOT of electrolytes in there at that low pH,  ChrisV’s recommendation is best, and dehydroxanthan works best when you are at really low (pH2.0?) 

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