Formula fails freeze/thaw but passes incubation and centrifugation

Hello everyone!

I’m coming today with a question about stability

I’ve tested one of my products and it keeps on failing the freeze/thaw test.
Emulsion didn't separate but the texture changed.

It passed incubation at 45*C for 2 months ( ongoing test) and centrifugation (warmed to 50*C and spun for 30 mins at 3000rpm).

The formula for this product is very simple:
Montanov 68  3%
Eumulgin SG   0.5%
Solagum AX 0.2%
Oils 14%
Shea butter 3%
cetyl alcohol 2%
Glycerin 4%
Pentylene glycol 3%
1388 eco 4 %
Lactic Acid. 0.35%
Water   up to 100

I would be very grateful if you could share with me your experience and thoughts.

Thank you in advance.

Comments

  • PhilGeisPhilGeis Member, Professional formulator
    What are chances of freezing in your distribution system?
  • ketchitoketchito Member
    @goska007 We usually put samples at different conditions from the start (not only heat). One condition is at 4-5°C degrees, and in an emulsion, it can tell you if you have some risk for crystallization, which you won't see in the oven, since the oven favors solubility.
  • JonahRayJonahRay Member
    For freeze/thaw issues I usually throw in 1% propylene glycol and it takes care of it.


    Jonah Ray | Owner & Founder

    build (skincare) | buildskincare.ca


  • MarkBroussardMarkBroussard Member, Professional Chemist
    @goska007

    Cut down on the Shea Butter to 1.5%. 
    Chemist/Microbiologist formulating in the Organic & Naturals & Clean Beauty arena under ECOCert/Natural Products Assn/Whole Foods/National Organic Program/Clean At Sephora/Credo Clean guidelines focused skincare & haircare products. 

    See website for details www.desertinbloomcosmeticslab.com
  • goska007goska007 Member
    PhilGeis the chance that my product will be exposed to freezing is very low (distribution in the UK) but let's say that someone will send it overseas and then it could potentially be exposed to some freezing... 

    ketchito I have tested my product in all conditions: fridge, freezer, incubator, room temperature etc.

    JonahRay I have 3% of pentylene glycol (naturally derived) in that formulation. Wouldn't it do the same job as it's a glycol as well? 

    MarkBroussard I've tried without shea butter and got the same problem
  • MarkBroussardMarkBroussard Member, Professional Chemist
    @goska007

    Then try changing emulsifiers
    Chemist/Microbiologist formulating in the Organic & Naturals & Clean Beauty arena under ECOCert/Natural Products Assn/Whole Foods/National Organic Program/Clean At Sephora/Credo Clean guidelines focused skincare & haircare products. 

    See website for details www.desertinbloomcosmeticslab.com
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