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Preservatives for shower gel
Good evening to everyone.I am writing for some formulation advice on the most appropriate preservative system to be included in a shower gel. These are formulations containing ethoxylated surfactants and I have not developed samples with the mixture: phenoxyethanol, dehydroacetic acid and benzoic acid.Do you have experience with this preservative system?I noticed, after months, the formation of small precipitates on the bottom of the bottle … can it be a problem of solubilization of the preservative? Thanks in advance!
Lisa -
4 Replies
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To get a good answer, you will need to post the Formula with wt/wt percentages. Off-hand, I doubt the precipitate is an issue of the preservative but likely another aspect of the Formulation.
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Most people use Sodium Benzoate instead of bare Benzoic acid which ain’t as soluble and might precipitate.
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dehydroacetic acid >
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Thanks for you for your valuable advices.
Surfactant base of my shower gel includes ‘ammonium lauryl sulfate’ as primary surfactant.
Could it be a interaction between primary surfactant and preservative (phenoxyethanol, dehydroacetic acid and benzoic acid)?Or a presence of Chelating agent (Tetrasodium glutamate diacetate)?
Thanks in advance
Lisa
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