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White cystal,no visible mechanical impurity. Nitrogen content 20.5% min. High quality,competitive price,sample is available.
Our agriculture grade ammonium sulphate can also be used in some industrial areas.
Technical specifications of Ammonium Sulphate (National Standard GB535-1995)
Item | Supreme grade | First grade | Qualified grade |
Appearance | White crystal,no visible mechanical impurity | no visible mechanical impurity | no visible mechanical impurity |
N content(dry basis),% ≥ | 21.0 | 21.0 | 20.5 |
Water content(H2O),% ≤ | 0.2 | 0.3 | 1.0 |
Free acid(H2SO4)content,% ≤ | 0.03 | 0.05 | 0.20 |
Fe content, % ≤ | 0.007 | - | - |
As content,% ≤ | 0.00005 | - | - |
Heavy metal(Pb)content,% ≤ | 0.005 | - | - |
Water insolubles,% ≤ | 0.01 | - | - |
Note: When ammonium sulphate is used in agriculture,it is not necessary to check the content of Fe,As,heavy metal and water insolubles. | |||
Ammonium sulphate fertilizer CAS: 7783-20-2