Home Cosmetic Science Talk Formulating General Off Topic Volatility/Vapor pressure in the presence of heat n relation to D5. A good read?

  • Volatility/Vapor pressure in the presence of heat n relation to D5. A good read?

    Posted by graillotion on November 4, 2022 at 3:10 am

    It has come to my attention from one of my brilliant friends (might be Swiss), that I might be ‘mommy bloggering’ my emulsions, and further diminishing their stability with the timing of the inclusion of D5.

    This of course is based on what I believe is the false assumption (I had) that D5 will volatilize at a much more rapid rate, when exposed to temps commonly utilized in the preparation of cosmetic emulsions.

    So, I have been adding D5 at cool down, due to consuming plenty of the misinformation that proliferates the web, and furthermore, weakening my emulsions by adding my most difficult to emulsify ingredient….last.

    Does someone have a link to a good read/link written in laymen’s terms…and not too many mentions of ‘Henry’s law’ and such.  Maybe something from a manufacturer?  I would like to fully understand the relationship between vapor (vapour from my Swiss friends) pressure, volatility, and heat (cosmetic levels).

    Thank you, and look forward to some good reading material or comments.

    pharma replied 1 year, 5 months ago 2 Members · 2 Replies
  • 2 Replies
  • graillotion

    Member
    November 4, 2022 at 8:15 am

    Well some wise-ass….messaged me…and said just read the technical papers and use Google translate to go from ‘English’ to ‘Laymen’.  :D

    Merci / Misotra / danke schön

  • pharma

    Member
    November 4, 2022 at 7:20 pm
    True, the higher the temps, the higher vapour pressure. With potentially flammable material, their flash point shouldn’t be reached. Vapour pressure is a factor where time is of the essence (hopefully, it doesn’t boild down to how long you can hold your breath LoL) if you don’t have hermetically sealed mixers and if you do, they should be made to withstand the theoretical pressure of the used volatile ingredients.
    Regarding D5: It’s a common solvent for silicone polymers/elastomers and emulsifiers. Some of these are hot process only ;) . The advantage of D5 over non-silicone volatile compounds is that it has low toxicity/irritation potential, no odour, high termal and chemical stability, and it’s difficult to set on fire (although, it is possible to ignite in vapour phase).
    BTW use THESE settings in Google translate :smiley: .

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