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!

Comments

  • Bill_TogeBill_Toge Member, Professional Chemist
    that depends on what's in the formula
    UK based formulation chemist. Strongest subjects: hair styling, hair bleaches, hair dyes (oxidative and non-oxidative) I know some stuff about: EU regulations, emulsions (O/W and W/O), toothpaste, mouthwash, shampoos, other toiletries
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