... well-known manufactory in China, We cooperate with Bayer use of sodium metabisulphite:Detailed Product Descriptionbest price,We are a well ... -known factory in China,we pass the ISOuse of sodium metabisulphiteSpecifications1. Purity: 97% min2.CAS NO: 7681 ... 43. Molecule weight: 190.12 4. Molecular Formula: Na2S2O5 Use Major use in industrial production, including dye, organic synthesis, printing, ...