Sodium benzoate is a substance which has the chemical formula NaC7H5O2. It is a widely used food preservative, with an E number of E211. It is the sodium salt of benzoic acid and exists in this form when dissolved in water. It can be produced by reacting sodium hydroxide with benzoic acid.
Used food preservative and soft drink products.
It is also used in personal care products like toothpaste, dentifrice cleaners, and mouthwashes.
It is used as an intermediate during the manufacture of dyes.
It is an antiseptic medicine and a rust and mildew inhibitor.
It is also used in tobacco and pharmaceutical preparations.
It is used as a fungicide.
A relatively recent use for sodium benzoate is as a corrosion inhibitor in engine coolant systems.
Sodium benzoate has recently been incorporated into plastics, like polypropylene, where it has been found to improve clarity and strength.