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Multiple preservatives in a system
Can we use two or three preservatives up to there upper limit for better preservation?
Ex: using %1 benzyl alcohol, %1 phenoxyethanol and %0.6 Sodium Dehydroacetate.
Total %2.6 preservatives?
Depends... usually, one uses blends in order to not just broaden the spectrum but also to be able to use lower amounts for the single constituents.
A preservative (or a blend thereof) should be used at the minimal required amount, not the maximum. Do some microbial contamination testing to figure out how much your product actually requires.
edited June 2020
blends are better but my question was is there any rule to not use two preservative to there maximum when we blend them?
For example: in Euxyl® k700 which is: Phenoxyethanol 30%, benzyl alcohol 30%, potassium sorbate 15%, tocopherol 15%, water 15%. The maximum allowed is %1.5, that becomes %0.45 benzyl alcohol and %0.45 phenoxyethanol.
Administrator, Professional Chemist
Preservative regulations are set based on the total amount in a formula. It doesn't matter if you add the preservative by itself or if it comes in a blend. If you get 0.45% phenoxyethanol from the blend, you could still add 0.55% more phenoxyethanol by itself.
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