Sodium metabisulfit

1) Purity (calculated with Na2S2O5): 97%

2) Iron (Fe): 0.005%

3) SO2: 65%

4) PH value: 4.0-4.6

5)Water insoluble matter: 0.05%

1) Purity (calculated with Na2S2O5): 97%

2) Iron (Fe): 0.0005%

3) Arsenic (As): 0.0002%

4) pH value: 4.0-4.6

5) Water insoluble matter: 0.05%

6) Heavy metal (Cal. in Pb): 0.002%

2.Textile antichlor after being bleached.

3.Reducing agent and sulfonating agent for chemical     and medical use.

4.Bamboo, wood, paper fiber bleaching agent, non-ferrous metal ore dressing agent, waste water treating , rubber freezing agent.