Sodium benzoate is a white granule or crystal powder, odorless or slightly benzoin smell, slightly sweet taste, there is a convergence flavor. Also known as sodium benzoin, relative molecular mass 144.12. Stable in the air, soluble in water, its aqueous solution ph value of 8, soluble in ethanol. Benzoic acid and its salts are broad-spectrum antimicrobial reagents, but their antibacterial effectiveness depends on the ph value of the food. With the increase of the acidity of the medium, its bactericidal and bacteriostatic effect is enhanced, and the sterilization and bacteriostatic effects are lost in the alkaline medium. The optimum ph value of its anticorrosion is 2.5~4.0.