Home Cosmetic Science Talk Formulating Imparting Thermal Stability

  • Imparting Thermal Stability

    Posted by gfeldman on September 15, 2014 at 4:08 pm

    In more of a general sense, what are some approaches that you as a formulator have taken to specifically add thermal stability to a lotion? I am trouble shooting a lotion right now and I am considering my options. Currently it has a very non-polar oil phase and I am concerned that perhaps that is contributing towards a lack of heat stability, but I’m not really sure (lotion is not falling apart, but loosing about 50% viscosity). Please keep in mind that I am still fairly new to the field; I was planning on either increasing the amount of Xanthan Gum or adding methyl hydroxyethylcellulose to address this issue. Alternatively would simply adding some stearyl alcohol or petrolatum help?

    Chemist77 replied 9 years, 10 months ago 2 Members · 4 Replies
  • 4 Replies
  • Anonymous

    Guest
    September 16, 2014 at 12:55 am

    I have had this issue with a cream that uses Olivem 1000 as the emulsifier. I have added Stearic Acid and Cetyl Alcohol and increased my gum level a little to help improve heat stability and it seems to be considerably improved. Interested to hear if others have had the same problem.

  • Chemist77

    Member
    September 16, 2014 at 1:10 am

    Increasing waxes I suppose won’t be of as much help as increasing the percentage of the polymer in the formula.
    @ gfeldman Try heating a carbopol gel to 70°C or above and you would see it for yourself the strength of the gel network. Accordingly you can make your decision.

    Cheers

  • gfeldman

    Member
    September 17, 2014 at 7:58 am

    @milliachemist I would love to increase the amount of polymer, but that will increase my initial thickness which is not something that I would desire. What other alternatives would you suggest?

    @Jeannie Thank you for the suggestion. That is roughly what I was considering doing, but I am afraid of introducing too much drag to the lotion if I start adding all these long chain alcohols to increase the heat stability. Right now it spreads like crazy, which is what I want. I will start with increasing the level of gum, but do you have any additional suggestions? Also, with regards to the Olivem1000 (which I like), I’m sure you already know this, but it is a bit hard to completely dissolve that stuff. I always heat it to 80C and keep it there for a while with some stirring before adding it to my water phase.

  • Chemist77

    Member
    September 17, 2014 at 8:15 am

    How about optimizing the increase of both the polymer and waxes, strike a balance and I am sure you can reach there.

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