DMDM hydantoin vs phenoxyethanol comparison as antibacterial for a lotion

In a lotion in combination with a fungicide, what percentage of DMDM hydantoin will have the same antibacterial properties as 0.5% phenoxyethanol?

Comments

  • PhilGeisPhilGeis Member, Professional formulator
    2000-3000 ppm is what I'd use
  • AbdullahAbdullah Member
    edited January 31
    @PhilGeis ; 2000 ppm of 55% solution with is 1100ppm actual DMDM hydantoin. Am i correct? 
  • PhilGeisPhilGeis Member, Professional formulator
    I referred to active concentration.
  • PhilGeis said:
    I referred to active concentration.
    Thanks. 
    I didn't know phenoxyethanol is that good as anti bacterial preservative compared to DMDM hydantoin.
  • PerryPerry Administrator, Professional Chemist
    @Abdullah - one of the problems with phenoxyethanol is the odor.

  • Perry said:
    @Abdullah - one of the problems with phenoxyethanol is the odor.

    Yes. 
    And for me reducing emulsion stability and viscosity of product is also a problem. But these two are the only options for bacteria i think. 
  • PhilGeisPhilGeis Member, Professional formulator
    You can use combinations of others based on pH but would need testing 
  • PhilGeis said:
    You can use combinations of others based on pH but would need testing 
    Yes but as these two are the least expensive, i have to stick with one or both of these two.
  • PhilGeisPhilGeis Member, Professional formulator
    There also better than the odd combination
  • PhilGeis said:
    There also better than the odd combination
    Yes
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