Food grade sodium hydroxide means that the content of sodium hydroxide and the content of impurities all meet the standards of the national standard GB5175-2008 of sodium hydroxide, the food additive, mainly used in food processing, production of leather eggs, dry goods invading seafood, pharmaceutical industry and the production of condiments. In the food industry, it is mainly used as acidity harmonic agent, and can also be used as wine bottle and grain and oil container for cleaning. The production and sale of food grade caustic soda should be issued by the national food additive sodium hydroxide production license and the quality inspection report issued by the manufacturer.