| 產品規格︰ | Specification:
1）Na2S2O4 :90%min
Fe : 20ppm max
Zn : 1ppm max
Other heavy metal (with Pb to calculate): 1ppm max
Matter which does not dissolve in water : 0.05%max
2） Na2S2O4 :88%min
3） Na2S2O4 :85%min
Pack.: iron bucket hermetic packing, inside liner double-layer plastic bag，net weight 50KG |
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