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Standard:HG/T 2826-1997
Uses:It is mainly used in dyeing, printing, organic synthesis, leather, drug .
Appearance: white or slight yellow crystalline powder.
Technical requirements:
| Index name |
Index |
| Top-grade |
First grade |
Qualified product |
| Main assay(as Na2S2O5), % ≥ |
96.0 |
94.0 |
92.5 |
| Fe, % ≤ |
0.005 |
0.010 |
0.015 |
| Water insoluble matter , % ≤ |
0.05 |
0.05 |
0.10 |
| As , % ≤ |
0.0001 |
-- |
-- |
Molecular formula:Na2S2O5
Relative molecular mass :190.10
Properties:Sodium pyrosulfite is white or yellow crystalline powder or crystal, Sg1.4
Packing & Storage: PVC woven bag lined plastic woven bag or laminated plastic woven bag; Do not mix with oxidant, acid, food chemicals. Avoid insolation, rain and high temp..
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