Heating and holding

Does it really have a considerable advantage on preservation to heat and hold both phases for 20 minutes? It would kill "some non-endospore forming bacteria".
But if your water and raw ingredient quality is good, have Good Manufacturing Practices, adequate broad spectrum preservatives and take the hurdle approach, is that really worth the time and energy?


  • In brief through experience--no
  • DASDAS Member
    It takes few seconds at 70° (pasteurization is 72° for 15 secs) and for the kind of products you make you are over that temperature. For 20 minutes is to kill spores. IMO it's worth the time if you are going to make a marketing campaign with the word overkill on it.
  • MicroformulationMicroformulation Member, Professional Chemist
    The Heat and Hold technique was never intended to increase the quality of your water or to provide any measure of increased sterility.

    In some emulsifiers (nonionics come to mind), the product was held at heat and mixed AFTER the oil and water phases were combined. It was felt to decrease the size of the micelles, leading to a more stable emulsion. It is a valid technique in some cases.
    markfuller@microformulation.com Microformulation.com Microformulation Cosmetic Consulting provides Custom Formulations for both large Commercial accounts as well as smaller entrepreneurs. We can provide Naturally compliant Formulations under the NSF, NPA, Whole Foods and USDA Organic Certifications. BS.Pharm Albany College of Pharmacy, Union University.
  • DoreenDoreen Member
    edited April 2018
    @DRBOB@VERDIENT.BIZ @DAS @Microformulation
    Thanks a lot for your answers!
    I totally agree with you. In a time where we are supposed to save energy instead of waste it, I think it's useless and also time consuming.
    I got confused because it is still advised on the new Making Skincare site for microbial reasons.

    So the original purpose was post-emulsification heating for emulsion stability for some emulsifiers like non-ionics. Makes a lot more sense.

    Erratum (in first post): instead of 'both phases', I meant the water phase only.
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