Phenoxyethanol SA Usage, Properties, and Compatibility in Formulations
Question
I am currently using Phenoxyethanol in my formula. Can I replace it with Phenoxyethanol SA at the same concentration?
Also, can Phenoxyethanol SA be used together with Pentylene Glycol?
What are the minimum usable pH and solubility limits for Phenoxyethanol SA, particularly when used at 1.25% in a cream formulation?
Answer
Information about Phenoxyethanol SA
Based on the information provided, here are the answers to your questions about Phenoxyethanol SA:
Minimum Usable pH: Phenoxyethanol SA can be used in formulations with a pH range of 2.0 to 6.0. The maximum pH is 6, and the minimum is 2.
Solubility and Usage in Cream: Phenoxyethanol SA has limited solubility in water (not more than 1.0%). If you are using 1.25% in a cream formulation, which is higher than its water solubility limit, you are correct that you will need an emulsifier or thickener, such as Pro Polymer, to help incorporate it into the formula and ensure it is properly dispersed. It should be added in the final step of the formulation process.
Replacing Phenoxyethanol: Yes, you can replace Phenoxyethanol (Extra Pure) with Phenoxyethanol SA at the same concentration in your formula.
Using with Pentylene Glycol: Yes, Phenoxyethanol SA can be used together with Pentylene Glycol. If your formula already contains Pentylene Glycol, you may be able to reduce the amount of Phenoxyethanol SA used, as Pentylene Glycol can act as a preservative booster.
Related Products Mentioned
Phenoxyethanol (Extra Pure)
Pro Polymer™ (Gel Maker)
Phenoxyethanol SA (eq. Optiphen Plus)
