Specification :

Sodium metabisulfite
Content( Na2S2O5) % e 96.5
Ferric( Fe) % d 0.003
Heavy Metal Content( Pb) % d 0.0005
Arsenic( As ) % d 0.0001

Name: Sodium pyrosulfite;
Molecular Formula: Na2S2O5
CAS NO.: 7681-57-4
Molecular Weight: 190.10

Appearance: White or yellow crystalline powder or small crystals, with strong SO2smell, specific gravity is 1.4, soluble in water, aqueous solution is acid, contact with strong acid will emit SO2 and generate the corresponding salts, for a long time in air will oxidization to Na2S2O4. Exceed 1500 will decomposition SO2.

Usage:
1. For industry it used as organic synthesis, printing, leather, pharmaceutical and other departments.
2. As a preservative in food processing, bleaching agent, leavening agent.
Packing And Storage:
Net 25, 50kgs plastic woven bags or barrel. Transport, storage should be prevented from damage, moisture, thermal metamorphic event. Strictly prohibited coexist with oxidants and acid; storage life is six month.