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Description:Chemical Formula: Na2S2O4 CAS No.: 7775-14-6 Appearance: Free-flowing white crystalline powder Odor: Odorless or with a slight odor of sulfur dioxide Pacgage: 15kg, 20kg, 25kg, 50kg, 100kg, 200kg iron drums with double polyethylene liners; 85%Grade 88%Grade 90%Grade Na2S2O4 85% Min 88% Min 90% Min Iron 20ppm Max 20ppm Max 20ppm max Solution clear Clear clear Application: It is widely used in the textile industry for vat yeing, reduction cleaning, printing and stripping, textile materials bleaching. It is also used in bleaching paper pulps, especially mechanical pulp; Bleaching kaolin clay and foodstuffs. As a reducing agent, it is used in organic ynthesizing.