Name: ZnSO4·7H is one kind of needle-like or powdery white or slight yellow crystal, density 1.957g/cm2.
Uses: used as material of zinc salt, mordant, preservative, insecticide, vomitory, clarifier, auxiliary material, or used in plating, bleaching and electrolysis.
Standard: HG/T2326－92 （％）
Item |
Index |
I |
II |
Top grade |
First grade |
Qualified product |
Top grade |
First grade |
Qualified product |
（as Zn ) ≥
Assay（as ZnSO4·H2O ) ≥
（as ZnSO4·7H2O ) ≥ |
35.70
98.0 |
35.34
97.0 |
34.61
95.0 |
22.51
99.0 |
22.06
97.0 |
20.92
92.0 |
Insolubles ≤ |
0.020 |
0.050 |
0.10 |
0.020 |
0.050 |
0.10 |
pH (50g/L solution) ≥ |
4.0 |
4.0 |
－ |
3.0 |
3.0 |
－ |
Chloride（as CI ） |
0.20 |
0.60 |
－ |
0.20 |
0.60 |
－ |
Pb ≤ |
0.002 |
0.007 |
0.010 |
0.002 |
0.010 |
0.010 |
Fe ≤ |
0.008 |
0.020 |
0.060 |
0.005 |
0.020 |
0.060 |
Mn ≤ |
0.01 |
0.03 |
0.05 |
0.01 |
0.10 |
－ |
Cd ≤ |
0.002 |
0.007 |
0.010 |
0.002 |
0.010 |
－ |
Cu ≤ |
0.001 |
－ |
－ |
0.002 |
－ |
－ |
Note:I is monohydrate，II is heptahydrate
Packing & storage: :40kg or 50kg in PE bag lined woven bag, kept in dry place, avoid insolation & rain. |
