Home Cosmetic Science Talk Formulating Will Zinc pyrithione precipitate or do creaming in this shampoo formula?

  • Will Zinc pyrithione precipitate or do creaming in this shampoo formula?

    Posted by abdullah on July 19, 2023 at 8:08 am

    This is a simple shampoo formula

    SLES 9%

    CAPB 3%

    Water

    Thickened with nacl

    If i add 2% Zinc pyrithione in this formula without any suspending agent, will zinc pyrithine precipitate at the bottom or cream to the top of shampoo bottle?

    fekher replied 7 months, 1 week ago 5 Members · 9 Replies
  • 9 Replies
  • Loretta

    Member
    July 19, 2023 at 9:40 am

    https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6467360/<div>
    </div><div>Zinc pyrithione can be dissolved by forming coordinate bonds with N-acyl-EDTA.
    </div><div>
    </div><div>https://www.gallinee.com/what-is-zinc-pyrithione-being-banned/
    </div><div>
    </div><div>Unless you’re an advanced chemist, please don’t try to make this at home. </div>

  • PhilGeis

    Member
    July 19, 2023 at 1:49 pm

    Do not use EDTA in a ZPT formula. It is not a matter of solution - it is no longer ZPT but the soluble sodium salt (PT) that will not deposi , not impact dandruff and will increase chemical risk due to PT solubility.

    • abdullah

      Member
      July 19, 2023 at 9:17 pm

      Thank

      Any comments about my question?

      If it is not suspended, with it cream like dimethicone or precipitate like EGDS?

  • evchem2

    Member
    July 20, 2023 at 10:11 am

    It would sink

  • PhilGeis

    Member
    July 20, 2023 at 10:45 am

    Suspension and deposition are as important as the ZPT active. You might look ar some of the P&G patents and article by Jim Schwartz re coacervate technology

  • abdullah

    Member
    July 20, 2023 at 9:40 pm

    Thanks

  • fekher

    Member
    July 26, 2023 at 3:36 am

    I made this researchement just for you @Abdullah because you are always helping others. https://www.hallstarbeauty.com/formula/zinc-pyrithione-based-antidandruff-shampoo/

    • abdullah

      Member
      July 26, 2023 at 9:00 pm

      Thank a lot 👍

      • fekher

        Member
        July 26, 2023 at 10:47 pm

        You are welcome.

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