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| Customization: | Available | 
|---|---|
| CAS No.: | 7783-20-2 | 
| Formula: | (Nh4)2so4 | 
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| Specification | Units | Superior product | First class | Qualified product | 
| Nitrogen content | % ≥ | 21 | 21 | 20.5 | 
| Sulfur(as S) | % ≥ | 23 | 21 | 23 | 
| Moisture | %≤ | 0.2 | 0.3 | 1 | 
| Free sulfuric acid (H2SO4) | %≤ | 0.03 | 0.05 | 0.2 | 
| Fe | %≤ | 0.007 | - | - | 
| As | %≤ | 000005 | - | - | 
| Heavy metal | %≤ | 0.005 | - | - | 
| Water-insoluble matters | %≤ | 0.01 | - | - | 
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