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How to add a 1% water soluble preservative to an anhydrous product?
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.
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2 Replies
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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.
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@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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