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Na₂S₂O₄

 90%

 88%

 85%

 85%

Iron (Fe)

 20ppm

 20ppm

 20ppm

 20ppm

Zinc (Zn)

 1ppm

 1ppm

 1ppm

 1ppm

Clarity

Clear

Clear

Clear

Clear

EDTA

Qualified

Arsenic (As)

 1ppm

Other heavy metals (Pb)

 1ppm

Formate (HCHO)

 0.05%

Water insoluble

 0.05%

 0.05%

 0.05%

-

Shelf life (month)

12

12

12

12

Na₂S₂O₄

90.89%

89.0%

86.51%

86.94%

Na₂S₂O₅

6.59%

6.68%

6.89%

6.57%

Na₂CO₃

1.69%

3.3%

5.7%

5.59%

Na₂S₂O₃

0.17%

0.19%

0.42%

0.39%

Na₂SO₃

0.21%

0.20%

0.38%

0.35%

Iron (Fe)

15ppm

13ppm

18ppm

11ppm

Zinc (Zn)

-

-

-

0.13ppm

Clarity

-

-

-

Clear

EDTA

-

-

-

Qualified

Arsenic (As)

-

-

-

0.28ppm

Heavy metal (Pb)

-

-

-

0.24ppm

HCHO

-

-

-

0.03ppm

Water insoluble

0.004%

0.007%

0.006%

-