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Product Name    Sodium pyrosulfite

molecular formula: Na2S2O5

Appearance:white  crystal  powder

Properties:

Sodium metabisulphite white or yellow crystalline powder or small crystallization, with strong smell, a proportion of SO2 1.4, soluble in water, become acidic aqueous solution, and acid contact is released SO2 generated corresponding salts, long for air, is oxidized to Na2S2O6, reason this product not far. Above 1500C, namely the SO2 decomposition.

Use:

Industrial used for printing and dyeing, organic synthesis, printing, the leather making, pharmaceutical and other department. In food processing of bleaching agent and antiseptic, osteoporosis agent.

Details:

Test item	Specification
	Reagent grade	Pharmaceutical grade
Appearance	Conform	Conform
Assay /%	≥95.0	≥92.0
Clarify degrees test	Conform	Conform
Water insoluble /%	≤0.005	≤0.01
Chloride (Cl)/%	≤0.005	≤0.02
Arsenic  (As) /%	≤0.0001	≤0.0002
Ferric (Fe)/%	≤0.0005	≤0.002
Heavy metal (Pb)/%	≤0.0005	≤0.002

high quality sodium metabisulfite Na2S2O5