This standard specifies the requirements, test methods, inspection rules, marking, packaging, transportation and storage of food additive silica. This standard applies to food additive silica produced by gas phase method and precipitation method. This product is mainly used as food anti-caking agent, thickener, stabilizer, essence and spice adsorption desiccant, clarification and filter aid, etc. Molecular formula: SiO|(2)·nH|(2)O