Specifications

Item

Test Results

Purity(As Na2S2O5)%≥97%

97.68

Sulfur Dioxide(SO2)%≤65%

65.81

Arsenic (AS)%≤0.0002%

0.00012

Selenium (Se)%≤0.0005%

0.0001

Heavy metals (As PB)%≤0.0005%

0.0.0003

Water Insoluble%≤0.02%

0.0013

Iron(Fe)%≤0.002%

0.0012

CAS NO

7681-57-4

PH Value: 4.0-4.8

4.4

Appearance

White crystal powder

Conclusion

Premium grade

Notes:  According to the national standard production