Methyl & Propyl Paraben 11/3 ratio

AbdullahAbdullah Member
edited June 4 in General
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?


Comments

  • PhilGeisPhilGeis Member, Professional formulator
    I've used 2/1 and 3/1.  Propyl has comparatively  limited solubility and considered more effective vs. fungi.
  • AbdullahAbdullah Member
    @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? 
  • PhilGeisPhilGeis Member, Professional formulator
    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.
  • AbdullahAbdullah Member
    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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