Sunscreen Spray Formulation: Preservative and Solubility
Question
I am developing a sunscreen spray formula with the following ingredients:
- Ensulizole 8%
- Bisdisulizole 10%
- Water
- Preservative 1%
Is a preservative necessary for this formula? How do Ensulizole and Bisdisulizole dissolve in this water-based formula?
Answer
Regarding your proposed sunscreen spray formula with 8% Ensulizole, 10% Bisdisulizole, water, and 1% preservative:
Yes, a preservative is necessary for this formula. Since the formula is primarily water-based, it is highly susceptible to microbial contamination (bacteria, mold, yeast). A preservative at an appropriate concentration (like the 1% you mentioned, depending on the specific preservative used) is crucial to prevent the growth of microorganisms, ensuring the product remains safe and stable for use.
Also, as mentioned previously, please remember that both Ensulizole and Bisdisulizole require the pH of the solution to be adjusted to an alkaline level to dissolve properly. Please refer to the product pages for specific instructions on how to achieve dissolution.
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