Difficulty formulating Salicylic Acid gel due to solubility and thickening issues
Asked by: borifle
On: October 21, 2015
Product Type:
Cosmetics
Question
I want to create a gel formulation containing 2% Salicylic Acid using standard Salicylic Acid, Propylene Glycol, and Polysorbate 20. I am encountering problems achieving a gel texture and preventing precipitation. How can I formulate this?
Answer
Based on the information provided, it is difficult to create a gel with 2% standard Salicylic Acid (BHA) because it requires a high concentration of Propylene Glycol and Polysorbate 20 to dissolve the Salicylic Acid and prevent precipitation. As explained, using such high levels of glycols makes it very challenging to form a gel texture. The alternative formulation suggested results in a toner, not a gel.
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Propylene Glycol (USP)
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Salicylic Acid (BHA, Pharma Grade)
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Polysorbate 20 (Tween 20)
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