• Formulating

  Emulsion Stability Question

  Posted by Anonymous on July 2, 2014 at 8:30 pm

  O/W emulsion in glass jar in 45C oven looks uniform except small amount of water or clear liquid on top. Any chance this could be condensation or something other than that emulsion is unstable? It just is not separating like other unstable emulsions I have seen before. Thanks in advance for any advice.

  OldPerry replied 10 years, 6 months ago 1 Member · 3 Replies
• 3 Replies

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  OldPerry

  Member

  July 2, 2014 at 8:36 pm

  Yes, that could be water condensation.  Did you do a Freeze/Thaw test?  This involves freezing a sample 24hrs, thawing for 24 hrs, heating for 24 hrs, then letting equilibrate to RT and taking pH/viscosity readings.  If it doesn’t separate through 2 or 3 of these cycles it’s probably just condensation.

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  Anonymous

  Guest

  July 2, 2014 at 8:49 pm

  Thanks, Perry. Could it still be condensation if sample was RT before going into oven? It was a cold process emulsion. I’ll try the F/T test. Good idea.

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  OldPerry

  Member

  July 8, 2014 at 10:27 am

  Yeah, that could still be condensation.

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