Home Cosmetic Science Talk Formulating General PET / Stability Testing

  • PET / Stability Testing

    Posted by Lifter09 on February 25, 2024 at 3:37 pm

    Hihi. I volunteer on a small farm, and we make some simple cosmetic-type products. I want to run preliminary preservative efficacy and stability testing on them. Since they are simple products, and we don’t make much money (if any at all), I’m hoping to put a protocol together for the preliminary run at least.

    Here’s the question - for preservative efficacy, what would I innoculate the samples with? I would need a bacteria and fungi / mold.

    Anyone willing to help me think this through?

    PhilGeis replied 1 month, 3 weeks ago 5 Members · 7 Replies
  • 7 Replies
  • Graillotion

    February 25, 2024 at 4:16 pm

    You can create reasonable stability testing at home…with centrifuge, incubator and freezer.

    PET is a ‘No-Go’ at home. Trust me…you want bona fide PET test result for your lawyer to keep on hand. 😉

    • This reply was modified 1 month, 4 weeks ago by  Graillotion.
    • Lifter09

      February 25, 2024 at 4:22 pm

      Does that mean that any product needs to go through PET testing legally? I’m just a small small farm and most of our products just go out as free samples to friends. I have every intention of going through proper PET testing when the time comes. That’s why I’m asking, is anyone willing to help me…

      • Graillotion

        February 25, 2024 at 4:26 pm

        If you live in the USA…it is not a requirement … Just prudent. We still operate in a cometic ‘Wild wild West’ here. 😆 or maybe…. 😫

        We have an essentially unenforceable mandate from the FDA….to produce a ‘SAFE’ product.

        • mikethair

          February 25, 2024 at 6:22 pm

          And this is about to change. The USA will adopt compliance standards similar to the EU. But it is in process now, and may be difficult to implement.

          • Graillotion

            February 25, 2024 at 7:14 pm

            Unfortunately….they left the million dollar barn door open. There will still be essentially no barrier to entry. 😭 I couldn’t have been more upset with this legislation….entirely for that reason. Still gonna be…. 🤠 in the USA…under a million.

            • PhilGeis

              February 27, 2024 at 8:19 am

              Let’s see where MoCRA comes out. Mike may indeed be right that preservative testing is required, and I’m sure 3rd parties (good and the EWG types) will offer their services as intermediaries. Haven’t heard that FDA will make that part official.

  • Microformulation

    February 25, 2024 at 7:52 pm

    PET should be performed by an appropriate and credentialed facility. The small volume you are making doesn’t change that technical requirement.

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