Home Cosmetic Science Talk Formulating AOS dilution issues


  • AOS dilution issues

    Posted by JRB on September 19, 2023 at 4:47 pm

    Hi everyone, total newbie to the cosmetics formulating world. I have lot of experience in industrial chemical formulating and manufacturing, but still getting my feet wet in this world. I’m working on preparing lab samples of AOS 40 from AOS powder. The final product is too dark and has a pH >9 whereas my control is pH 7.5. Any suggestions as to what I am doing wrong? Thanks!

    Safa replied 2 months, 1 week ago 3 Members · 3 Replies
  • 3 Replies
  • chemicalmatt

    September 21, 2023 at 10:28 am

    Hey @JRB we don’t get our “feet wet” but we do get our hair wet in this trade. Joking aside, you likely have a tech grade AOS, one with too many “cats & dogs” as we call those many side-products in surfactant synthesis. Among those olefins lurk poly-unsaturates, all of which decompose to darker color when heated for extended periods. Try using less heat and longer dwell time, adding a little hydrotrope to help this along.

  • JRB

    September 21, 2023 at 1:20 pm

    Thank you @chemicalmatt much appreciated!

  • Safa

    September 21, 2023 at 3:42 pm

    hi,can you please teach me how do i post a question for everyone on the website because i need an answer to a specific question .

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