-
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? -
4 Replies
-
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. -
@yes 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. -
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.
-
@Perry thanks