propyl paraben vs sodium propyl paraben

Hello,
simple question:
I am going to order preservatives, which one of these should be better for cream and o/w emulsions?
In what are they different (apart from the sodium part, of course)
Are the quantities to be used different?
thanks!

Comments

  • Solubility is the only thing different. The sodium salt paraben is soluble in water at RT while propyl paraben should be dissolved in water at 70-80 C.

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