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Sodium Metabisulfite Used for Chemical and Medicine Reducer and Sulfonating Agent, Find Details and Price about Sodium Pyrosulfite and Disodium Disulfite from WEIFANG QIANGYUAN CHEMICAL INDUSTRY CO., LTD. Featuring High Purity Grade: Purity ranges from 90% to 99% with minimum 96.5% Na2S2O5 content.