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

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2.Molecular Formula: Na2S2O5?

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3.CAS No.:?7681-57-4

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4.?Physical appearance: white or slightly yellowish crystalline powder

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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

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6. Main use:?For tech use

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?????????????????????? 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