• Formulating

  pH drift

  Posted by chemnc on March 29, 2017 at 7:45 pm

  I was reading the other day about many commercial products that have been sitting on store’s shelves for a while showing significant pH drifts (up to a full unit). This is scary at so many levels. I wonder whether anybody has seen this and what the culprits were.

  OldPerry replied 7 years, 7 months ago 3 Members · 2 Replies

  • stability
• 2 Replies

• 

  belassi

  Member

  March 29, 2017 at 9:23 pm

  My last-but-one delivery of Plantaren APB (an ammonium based surfactant blend) just began smelling of ammonia, so I just used it all up making some body shampoo. Obviously the pH must have drifted and become on the wrong side of 7. I adjusted it with citric acid of course, but it goes to show what happens.

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  OldPerry

  Member

  March 30, 2017 at 7:34 pm

  This is why we do stability testing. It’s difficult to predict when a system will experience pH drift.

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