• Formulating

  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, 9 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

  fdbaptista2017 said:

  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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