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Methyl & Propyl Paraben 11/3 ratio
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?
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