1.Name: sodium metabisulfite; sodium metabisulphite; sodium pyrosulfite.

2.Molecular Formula: Na2S2O5 

3.CAS No.: 7681-57-4

4. Physical appearance: white or slightly yellowish crystalline powder

5. Specification:Main Content: 96.5%min, Water Insoluble: 0.05%max, Iron: 50ppm max, Pb: 10ppm max, As: 2ppm max ,pH: 4.0-4.6

6. Main use: For tech use

                       a):Bleaching agent for textile fibres, paper pulps

                       b):Colors stripper and dechlorination

                       c):Preparation of Indigo Vat Dye

                       d):solubilizing and acidyfing agent for leather industries

                       e):wastewater treatment