Zinc sulfate heptahydrate powder
Zinc sulfate heptahydrate is a Inorganic Chemicals.Zinc sulphate heptahydrate is white granules or powder at normal temperature and has a molecular weight of 179.47, also known as cesium, zinc technetium, and a density of 1.957 g/cm3. It is easily soluble in water, slightly soluble in ethanol and glycerin, and is gradually weathered in dry air. At 39°C, ZnSO4·7H2O loses one crystal water and turns into ZnSO4·6H2O. At 70°C, it loses the crystallization water and turns into ZnSO4·H2O. At 280°C, it loses all the crystal water and becomes anhydrate. When heated to 767°C, it decomposes into zinc oxide and sulfur trioxide. Zinc Sulfate Implementation Standard (HG/T2326-2005):
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Zinc sulfate Heptahydrate |
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Excellent product |
First grade |
Qualified products |
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Main content |
counted with Zn,%≥ |
22.51 |
22.06 |
20.92 |
counted with ZnSO4·7H2O,%≥ |
99.0 |
97.0 |
92.0 |
|
Insoluble content,%≤ |
0.020 |
0.050 |
0.10 |
|
PH,≥ |
3.0 |
3.0 |
―― |
|
Chloride(counted with Cl),%≤ |
0.20 |
0.60 |
―― |
|
Pb,%≤ |
0.001 |
0.010 |
0.010 |
|
Fe,%≤ |
0.003 |
0.020 |
0.060 |
|
Mn,%≤ |
0.005 |
0.10 |
―― |
|
Cd,%≤ |
0.010 |
0.010 |
―― |