Home Cosmetic Science Talk Formulating How to add a 1% water soluble preservative to an anhydrous product?

  • How to add a 1% water soluble preservative to an anhydrous product?

    Posted by graillotion on May 6, 2023 at 4:54 pm

    I listened again to the Q & A with Dr Phil Geis and Perry, ( @PhilGeis ) and came away with a question.

    I work with a lot beginners…and they tend to gravitate towards anhydrous things ( a good thing). On occasion they want to add a preservative to this system. Dr Geis mentioned that a water soluble preservative was the preservative of choice. (There is a possibility the context is wrong…but almost sure the topic was….anhydrous.)

    As I have never made an anhydrous product in my life…. I was curious as to how 1% of water soluble preservative would be incorporated. Can anyone suggest how this is done? Is a solubilizer required for a 1% add?

    I do not have plans to ever make an anhydrous product… but those I try and help, certainly do.

    Aloha.

    • This discussion was modified 11 months, 1 week ago by  Graillotion.
    • This discussion was modified 11 months, 1 week ago by  Graillotion.
    markbroussard replied 11 months, 1 week ago 3 Members · 2 Replies
  • 2 Replies
  • PhilGeis

    Member
    May 7, 2023 at 3:25 am

    Think my comment was for a scrub - that, if a preservative was added, it should be available to probable water exposure.

    I’ve used parabens for powders to address Aw changes from humid bathrooms.

    Wish I could help with the how. I’m just a micro guy with limited formulation knowledge. I was blessed with excellent formulators.

  • markbroussard

    Member
    May 7, 2023 at 6:26 am

    @Gaillotion

    You just add it in and stir until the mixture becomes uniform. Phenoxyethanol/EHG is good for these types of formulas as it is sufficiently oil soluble to work. Glyceryl caprylate (and) Glyceryl undecylenate is oil soluble so you just drop it in.

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