Chemical name: Sodium metabisulfite
Molecular formula: Na₂S₂O₅ 
Molecular weight: 190.12(according to international atomic weight in 1961)CAS NO: 7681-57-4
Appearance: white liquid crystal or powder
Specification: food grade and industrial grade
Properties: white or light yellow crystal powder. Specific gravity is 1.4. It dissolves in water or glycerin. The solubility will expand when the temperature increases.

Use: Sodium metabisulfite is widely used to produce bleaching of textile and organics, mordant, food storage, brewage, organic synthesis, etc.
Quality standard: implementing according to CB601-85.