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Sodium Benzoate

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Sodium Benzoate, FCC Kosher   
CAS No.532-32-1
Sodium Benzoate is a food grade preservative generally regarded as safe (GRAS) worldwide. It is the inactive salt of benzoic acid. It is soluble in water where it converts to benzoic acid, its active form, at a low pH. Benzoic acid is very pH dependent. While it shows some activity up to pH 6 (about 1.55%), it is most active at pH 3 (94%).
As benzoic acid, it is considered to be primarily an anti-fungal, but it shows some activity against bacteria.  It is poor against pseudomonads.  Benzoic acid is inactivated by non-ionics and by raising the pH.
Sodium Benzoate is not a broad spectrum preservative for cosmetic use and should be combined with other preservatives. If Sodium Benzoate is used as a preservative, the pH of the finished product may need to be lowered enough to release the free acid for useful activity. 
Sodium Benzoate is often Benzoate is often combined with Potassium Sorbate in low pH products to provide a synergistic preservative effect against yeas