Properties : White or buff crystal powder.
Application: Mainly used in printing and dyeing, medicine, tanning, etc.
Packing : 25kg/bag
Standard : GB 1893-86
Items
Specification
Result
Sodium Metabisulphite(as SO2)
65% min
65.2%
Iron Content
0.005% max
0.003%
Water-insoluble
0.05% max
0.043%
pH Value
4.0~4.6
4.4
Heavy Metal(as Pb)
0.001% max
As
0.0002% max
0.0001% max
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