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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 combined with Potassium Sorbate in low pH products to provide a synergistic preservative effect against yeast and mold.

Following is a chart of the relative activity at various pH:

Activity of Benzoic Acid
pH % Active Benzoic Acid
3 94
4 61
5 13.7
6 1.55
7 0

 

There is some concern that Sodium Benzoate in combination with L-Ascorbic Acid in products can form Benzene, a known human carcinogen. The presence of ascorbic acid and benzoates alone does not lead to the formation of benzene.  Certain additional conditions are required for trace levels of benzene to form, including heat, ultraviolet light and metallic ions in the mixture. Therefore, a product containing ascorbic acid and benzoates will not necessarily contain any detectable levels of benzene.  The use of EDTA, which chelates metallic ions can therefore be of assistance in the inhibition of benzene formation.    Citric Acid is not thought to induce significant benzene production in combination with Benzoic Acid, but some evidence suggests that in the presence of ascorbic acid and benzoic acid, citric acid may accelerate the production of benzene.  Therefore, the use of Sodium Benzoate and L-Ascorbic Acid and Citric Acid in the same cosmetic formulations should be avoided. 

PLEASE NOTE:  While our Sodium Benzoate is a food grade product, it is repackaged as a cosmetic raw material and is for external use only!  Do not purchase this for use in food processing!

All cosmetic products should undergo microbial testing to ensure the efficacy of any preservative system.

Recommended Use Levels: Up to 1%
Appearance: White noodles (prills)
Solubility: Soluble in water up to 55%
Country of Origin: China
Storage:Store in a cool dry place away from heat or light.


INCI: Sodium Benzoate

Here you will find Safety Data Sheets (SDS) and Technical Data Sheets. The files are in PDF format. To access a file, click on the relevant button or the file name. For your convenience, it will open up in a new browser window.

Please note: You must have Acrobat Reader to view the files listed here. If necessary, the Acrobat Reader link will directed you to a page where it can be downloaded.

Technical Data

 
Safety Data Sheet (SDS)

Sodium Benzoate SDS

 


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