Home Cosmetic Science Talk Formulating pH stability

  • pH stability

    Posted by Anonymous on January 18, 2019 at 3:20 pm

    Hello,
    I’m new at this cosmetic formulation world and I’m trying to develop an exfoliant shower gel. I’m using SLES/CAPB as the surfactant system and carbomer to suspend the exfoliating particles. When I thought I had a nice formula, I realized that the pH is not as stable as I would like - it dropped from 5.7 to 4.8 in 15 days. Is this normal? What should I do?
    Thank you in advance!

    em88 replied 5 years, 2 months ago 1 Member · 3 Replies
  • 3 Replies
  • em88

    Member
    January 20, 2019 at 11:45 am

    That might be a problem. Make a stability test, normal and accelerated and check how the pH changes overtime. 

  • Anonymous

    Guest
    January 21, 2019 at 4:14 pm

    Thank you, em88. 
    Stability tests are ongoing.
    I did a microbiology test (using a Dipslide Kit) and it’s clear.
    What should be the cause of pH dropping?

  • em88

    Member
    January 22, 2019 at 12:51 pm

    What should be the cause of pH dropping?

    It depends on the ingredients you are using.
    Maybe a buffer can solve your issue. 

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