Home Cosmetic Science Talk Formulating General Methyl & Propyl Paraben 11/3 ratio

  • Methyl & Propyl Paraben 11/3 ratio

    Posted by Abdullah on June 4, 2022 at 3:37 am

    In most of preservative blends that anti fungal is methyl & Propyl Paraben and antibacterial is phenoxyethanol, DMDM hydantoin or Diazolidinyl Urea, the ratio of methyl/Propyl Paraben is 11/3. 

    Is this ratio because it dissolve best in solvent like phenoxyethanol or propylene glycol, or it dissolve best in water or because it has best preservation power in this ratio?

    Abdullah replied 2 years ago 2 Members · 4 Replies
  • 4 Replies
  • PhilGeis

    Member
    June 6, 2022 at 2:52 pm

    I’ve used 2/1 and 3/1.  Propyl has comparatively  limited solubility and considered more effective vs. fungi.

  • Abdullah

    Member
    June 6, 2022 at 3:49 pm

    @PhilGeis parabens are not very water soluble. If we use 0.2% methyl Paraben & 0.1% propyl Paraben with phenoxyethanol in emulsion or water only products, how can we keep the parabens in water phase? 

  • PhilGeis

    Member
    June 6, 2022 at 4:14 pm

    A formaldehyde releaser with 2/1 Methyl/Propyl was the classic preservative combination for emulsions for 30 years. Combine with a solvent like prop glycol or in heated water phase - not in oil phase.  Partitioning can be an issue and should be addressed.

  • Abdullah

    Member
    June 7, 2022 at 1:57 am

    PhilGeis said:

    A formaldehyde releaser with 2/1 Methyl/Propyl was the classic preservative combination for emulsions for 30 years. Combine with a solvent like prop glycol or in heated water phase - not in oil phase.  Partitioning can be an issue and should be addressed.

    Does Paraben need to be heated to dissolve in water?

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