Home Cosmetic Science Talk Formulating Salicylic acid 20 %solution

  • Salicylic acid 20 %solution

    Posted by Anonymous on November 13, 2018 at 3:14 pm

    Hello
    Im trying to make 20%salicylic acid solution 
    I mixed the SA with 20ml ethanol and complete to 100 ml with Propylene Glycol 
    It disoolved and make a clear solution with aid of heat… But after while Crystal formed again  . So i need help what can i do to make it stable 

    chemicalmatt replied 6 years, 7 months ago 2 Members · 2 Replies
  • 2 Replies
  • em88

    Pharmacist
    November 14, 2018 at 9:50 am

    You can add more ethanol and make sure ethanol is not evaporating. 
    I’d suggest to weight your ingredients and not use volume. 

  • chemicalmatt

    Member
    November 14, 2018 at 10:11 pm

    IF you can live with some little benzyl alcohol or phenoxyethanol in your formula, those two will increase SalAc solubility and are miscible with PG too. 

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