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Sodium pyrosulfite

Molecular formula: Na2S2O5

Molecular weight: 190.10

Properties: white or light yellow powder. Freely soluble in water. The aqueous solution is acidic. 

Purity ≥ 95.0%
Clarity test Pass
Water insoluble substances % ≤ 0.005
Chloride(Cl) % ≤ 0.005
Fe % ≤ 0.0005
As % ≤ 0.0001
Heavy metal(count by Cu) % ≤ 0.0005

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