Article by: Perry Romanowski

Welcome to Day 5 of the 30 Days to Become a Better Cosmetic Chemist series

Get the 30 days to become a better cosmetic chemist book

This 30 day challenge is all about giving you basic exercises that will improve your abilities as a cosmetic chemist.female cosmetic chemist

In this episode

In today’s episode I’ll share:

  • Information about stability testing
  • Why stability testing needs to be done
  • 6 step method for conducting a proper stability test
  • Equipment needed to run a stability test
  • Factors which determine a formula’s stability
  • When you should do stability tests

Relevant to Exercise

See this video I did on stability testing

If you have questions about stability testing leave a comment below. Also, let us know how your mini stability test worked out.


TAGS:30 days


  1. Avatar

    Hope this is a good lesson

  2. Avatar
    Dr. Omji POrwal

    Hi Perry,
    Thank you!
    This is an excellent knowledge sharing presentation. Really helpful.
    Thank you
    Dr. Omji Porwal
    Corel , India

  3. Avatar

    This is extremly good

  4. Avatar

    Hi , I was wondering if there is some domestic way to measure viscosity without having to buy a viscosimeter, which seems to be quite expensive!

    1. Avatar
      Perry Romanowski

      Not any reliable way. You can look for a used viscometer on eBay or Amazon.

  5. Avatar
    ahmad bakhsh

    Do we have accurate emulsion stability and emulsion aging test for cosmetics just like pesicides emulsions?

    1. Avatar
      Perry Romanowski

      I don’t know the pesticide method for determining emulsion stability so I can’t really say.

      Stability testing for emulsions is a subjective test in the cosmetic industry.

  6. Avatar
    Bilson Shukla

    Hi Perry,
    Thank you!
    This is an excellent knowledge sharing presentation. New doors open in my mind and new thoughts about stability testing. Really helpful.
    Thank you
    Dr. Bilson Shukla
    Elkay Silicones, India

  7. Avatar

    Hello Perry
    This is an excellent presentation. Thank You for the information on stability testing

    1. Avatar
      Perry Romanowski


  8. Avatar
    Evelyn Fontanilla

    Very informative, explanation is clear enough to be understood for a beginning cismetic formulator.

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