 【English name】:Anhydyous sodium sulphite
【Molecular formula】:Na2SO3
【Molecular weight】:126.04
【CAS No】:7757-83-7
【Content】:96%,97%,98%
【Characters】:White crystal powder. Specific gravity is 2.633, soluble in water and slightly for alcohol.
【Use】: mainly used in printing, pharmaceutical, papermaking, food and other industries.
Technical index |
High pure grade |
Industrial grade |
Photograph grade |
sodium sulfite |
excellent grade |
first grade |
sodium sulfite |
Na2SO3 ≥ % |
98.0 |
97.0 |
96.0 |
97.0 |
Iron(Fe) ≤ % |
0.003 |
0.003 |
0.005 |
0.002 |
Water insoluble ≤ % |
0.01 |
0.02 |
0.03 |
0.05 |
Free alkali(Na2CO3)≤ % |
0.001 |
0.1 |
0.4 |
0.15 |
Sodium sulfate (Na2SO3) ≤ % |
1.2 |
2.5 |
— |
— |
Sodium Chloride(NaCl) ≤ % |
0.003 |
0.1 |
— |
— |
Heavy metal(Pb) ≤ % |
0.001 |
— |
— |
0.002 |
Arsenic(As) ≤ % |
0.0001 |
— |
— |
— |
Sodium thiosulfate ≤% |
0.001 |
— |
— |
0.0015 |
Water solution appearance |
qualified |
— |
— |
qualified |
Silver nitrate ammonia solution reaction |
qualified |
— |
— |
qualified |
|
