Home Cosmetic Science Talk Formulating Need help with preservative system

  • Need help with preservative system

    Posted by EarthenSun on June 13, 2023 at 10:19 am

    need product (shampoo) to be PEG, Propylene Glycol and Paraben free; finished product = 5.5 – 6
    EU regulations say can only use 0.02 IDBC
    Would an appropriate preservative system be:
    1.0 Euxyl® PE 9010 (Phenoxyethanol, Ethylhexylglycerin)

    0.02 Glycacil L (Iodopropynyl Butylcarbamate)

    0.2 EDTA

    Can pentylene glycol be added or is it too similar chemically to propylene glycol.

    PhilGeis replied 1 year, 1 month ago 4 Members · 8 Replies
  • 8 Replies
  • Abdullah

    Member
    June 13, 2023 at 10:26 am

    What is your formula?

    PE 9010 and EDTA may be enough.

    No need for IPBC.

    If you wanted to add another anti fungal, add sodium benzoate.

    • EarthenSun

      Member
      June 13, 2023 at 10:29 am

      0.3 Sodium Benz?

      • Abdullah

        Member
        June 13, 2023 at 10:35 am

        Yes

    • PhilGeis

      Member
      June 14, 2023 at 5:22 am

      Shampoos are generally resistant to fungal contamination. But Abdullah is spot on - add benzoic acid as a booster vs bacteria - with surfactants its effective pKa is increased you’ll have an effect at that pH.

  • SaintOtis12

    Member
    June 15, 2023 at 3:20 am

    What is the exact ratio of each component?

    Minesweeper

    • PhilGeis

      Member
      June 15, 2023 at 6:03 am

      If phenoxy 0.3-0.5 and 0.25 Benzoate - with EDTA 0.1 as the acid

      • Abdullah

        Member
        June 15, 2023 at 7:50 am

        So we should use 0.15% tetrasodium EDTA to get 0.1% in acid form?

        • PhilGeis

          Member
          June 15, 2023 at 8:01 am

          Whatever the math says. but that’s just the way I tried to get consistency - prob doesn’t make too much diff.

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