1. Name: Sodium Metabisulphite

2. Molecular formula: Na2S2O5

3. Molecular weight: 190.09

4. Physical and Chemical property: strong SO2 odour, proportion is 1.4, melting point >300℃, density 1.48

solubility: soluble in water ,alcohol, and acetone and in acidic solution, Na2S2O5+ strong acid →SO2+salt, Na2S2O5+O2→Na2S2O6, Na2S2O5(1500°C)→SO2 and others .

5. Specification Industry/food

6. Appearance White crystalline