Item
Quality Index
Food Grade
Industry Grade
Purity ( As Na2S2O5)
98.0% min
96.0% min
Sulfur Dioxide( SO2)
65.0% min
Arsenic ( As )
0.0002% max
-
Heavy metals ( As Pb )
0.0005% max
Selenium (Se )
Iron (Fe)
0.001% max
0.002% max
Water insoluble
0.02% max
0.05% max
PH value :
4.0-4.8
Remark :
Conformed with FCC V and E 223 Standard
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