Home Cosmetic Science Talk Formulating Reduce oil syneresis without waxes


  • evchem2

    July 14, 2022 at 8:06 pm

    Cab-o-sil is available from Amazon.. though I’m still a little warying of ordering chemicals off there. You can also use Aerosil 200  from Evonik , but I’d recommend wearing a respirator-like mask if you deal with large quantities

  • HAL49

    July 31, 2022 at 10:19 pm

    JonahRay said:

    Okay, after tons of trial and error and knockouts the issue still persists. I reached out to Wacker for information on their silica dimethyl silylate (HDK H15) - though I use the one from Making Cosmetics. They told me that silica dimethyl silylate is hydrophobic so it can disperse in lipids but its actually the hydrophobicity that allows it to thicken because the resistance to water builds viscosity and therefore it is more appropriate for aqueous systems… They recommended hydrophilic fumed silica (HDK H20). Does anyone know of any suppliers or similar materials on the market for this use? Or honestly am I just crazy… its advertised as an oil gelling agent on Making Cosmetics…

    Edit: It looks like possibly Cab-o-sil is an option? Does anyone know where I can purchase this?

    Both types of fumed silica work as oil gelling agents , but hydrophilic is more efficient (altought peg-8 dimethicone and glycerin might interfere with the gelling) , just one thing to consider is that hidrophobic one gives a more elegant feel to the product
    in my experience with fumed silica when used alone it failed most of the time to avoid syneresis even when the liquid to gel was an individual oil not a mixture of oils
    so I would suggest to incorporate another gelling agent , I see you have tribehenin but not sure is in a sufficient amount to be helping (also not sure how good gelling of this blend is)
    There are a lot of options but first that come to mind are:
    • silicone crosspolymer as @Graillotion suggested
    • Disteardimonium Hectorite (but it might substantially change texture and appearence)
    • I know you don’t want waxes but I think bleached beeswax would work wonders on this formula

  • MariaSibon

    November 14, 2022 at 1:42 pm

    Regarding the suppliers, Silica Dimethyl Silylate can be also sourced by Sensient as Covasillic15.
    I am very interested to the fumed silicas chemistry so let us know if you had any luck by changing from hydrophobic to hydrophillic.

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