Maximum Variability in pH Level in a Packaged O/W Emulsion Product?

After an O/W emulsion, like a lotion, has been determined to be fully stable and then packaged in perfectly adequate HDPE plastic packaging; how much, if at all, might the pH level (+ or -) of the lotion naturally vary over a six month, one year, and one and a half year time frame during which there are no storage or temperature variation issues and the HDPE plastic packaging performs well?

I would greatly appreciate any and all answers, comments or discussion.  Thanks!


  • Bill_TogeBill_Toge Member, Professional Chemist
    that depends on what's in the formula
    UK based former cosmetic chemist with 13 years' experience at the bench. I've worked with pretty much everything apart from pressed powders, soap, solid lipstick and aerosols. Now working in the messy world of screen-printing inks.
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