Home Cosmetic Science Talk Formulating General Stability test question

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  • Stability test question

    Posted by Shaypigs4 on September 12, 2020 at 1:41 am

    I am “freeze thaw” stability testing my products and so far only one has separated once it thawed out. Basically it contains 7% AHAs (mixed extracts), some calming antioxidants around 2%, preservative, chelating agent (tetrasodium), and I added a cold process emulsifier (sepiplus 400 at 2%) to thicken it a little. One it was thawed, when I picked it up I saw what looked to be a cloud of particles inside mainly floating toward the top of the liquid. I shook it 3 times and it looked perfectly mixed again, same as when I fisrt made it. Does this separation mean it’s unstable and I should change the formula or is it ok?

    oldperry replied 3 years, 6 months ago 2 Members · 1 Reply
  • 1 Reply
  • oldperry

    Member
    September 12, 2020 at 3:29 am

    Probably unstable 

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