Home Cosmetic Science Talk Formulating Are their rules for combining different ionic ingredients

  • Are their rules for combining different ionic ingredients

    Posted by MTM on March 29, 2023 at 1:25 pm

    I am formulating a shampoo bar using Sodium Cocoyl Isethionate as my main surfactant, which is compatible with anionic, non-ionic and amphoteric surfactants. Is it advisable to include BTMS-25 which is cationic? Is there rules about combining ingredients of this nature? My goal would also be to achieve a pH of 5.5-7, will preservatives be necessary if the formulation is anhydrous or would the surfactants be sufficient enough in retarding the growth of pathogens on the areas exposed to water? I have seen a few research study’s and anecdotal evidence that leads me to believe it may be fine. Any advice is greatly appreciated, thank you!

    ozgirl replied 11 months ago 3 Members · 2 Replies
  • 2 Replies
  • abdullah

    Member
    March 29, 2023 at 7:04 pm

    You don’t need to add preservative or BTMS

  • ozgirl

    Member
    March 30, 2023 at 4:11 pm

    Use a preservative. Your product will be exposed to water during use.

    I have seen BTMS used succesfully in shampoo bars as there is little interaction between the components in the solid state. You could also swap it out with a polyquat or other conditioning agent that is more compatible with anionics.

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