Sodium diacetate is a molecular compound of sodium acetate and acetic acid, referred to as SDA for short, also known as sodium diacetate and disodium diacetate. Japan is also known as solid acetic acid. It is white crystal powder with hygroscopicity and slight acetic acid smell. Combustible, soluble in water and ethanol. The toxicity is very low. The oral LD50 of mice is 3.31g/kg, that of rats is 4.96g/kg, and the daily allowable intake (ADI) of each person is 0~15Chemicalbookmg/kg. The final metabolites of sodium diacetate in organism are water and CO2, which will not remain in human body, and have no damage or side effects on human beings, animals and ecological environment. Because it is safe, non-toxic, residue-free, carcinogenic and teratogenic, it is recognized as an "O" toxic substance by the United Nations Health Organization, and approved by the Food and Agriculture Organization of the United Nations (FAO) and the World Health Organization (WHO) as a mildew-proof, preservative and preservative for food, grains and feeds.