Home Cosmetic Science Talk Formulating “Frosty” patch on the surface of anhydrous ointment

  • “Frosty” patch on the surface of anhydrous ointment

    Posted by doxtera on July 17, 2023 at 9:06 am

    Hi all, I am facing a situation here the surface of this anhydrous ointment look patchy/frosty after letting cool down at room temperature. I found out this appearance is more apparent when I dispense it in a wide surface container. Appreciate if anyone can tell me if the same issue has happened before and how to solve it.

    Formula:

    Petroleum jelly 85.7% w/w

    Fully refined paraffin wax 0.33% w/w

    Stearic acid 5% w/w

    Liquid paraffin 2.49% w/w

    Menthol 3.34% w/w

    Eucalyptus oil 3.14% w/w

    doxtera replied 9 months, 1 week ago 4 Members · 6 Replies
  • 6 Replies
  • evchem2

    Member
    July 18, 2023 at 11:55 am

    Does this happen if you leave out menthol?

    • doxtera

      Member
      July 19, 2023 at 4:46 am

      Yes, it does still

  • gordof

    Member
    July 19, 2023 at 6:20 am

    dose it happen if you put a cling film over the surface of your product while cooling down? (really on the surface directly not over the Conntainer it self )


    Maybe it absorbs a little bit o water from the surrounding air if humidity is high that can lead to a cloudy fog-like appearance but only in the top area of the product.

    best wishes

    Tobias

    • This reply was modified 9 months, 1 week ago by  gordof.
    • doxtera

      Member
      July 22, 2023 at 11:05 pm

      Thanks. I will try that. I am living in a hot humid country so this could be the problem

  • Loretta

    Member
    July 19, 2023 at 8:04 am

    I would lower the amount of menthol and petro jelly. Why are you using that? There are other items to use than that.

    • doxtera

      Member
      July 22, 2023 at 11:10 pm

      It is cost related issue. I am making a mild analgesic ointment, the menthol is added to add a cooling sensation. May I know which ingredient will you suggest to replace the petroleum jelly if I reduce it? Thank you

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