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Ammonium sulphate

Basic information

  • CAS No:7783-20-2
  • EINECS No.:231-984-1
  • Molecular formula:(NH4)2SO4
  • Purity:99% min
  • Nitrogen content:21% min
  • Appearance:White crystal /granular
  • Package:Packed in PP woven bags with PE film liner. Net weight of each bag: 50kgs

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.


Industrial ammonium sulphate is white or light grey crystal. It is hydroscopic,and apt to dissolve in water(not in alcohol or acetone),and it will become solid blocks when absorbing moisture. The aqueous solution is alkalinous. It reacts with alkali to release ammonia gas.

Storage and transportation:

Stored in cool,dry and ventilated warehouse. It must not be put together with Alkali stuffs,such as lime,cement,etc.Do not expose it to sunlight and rain during transportation .Do not damage the packing bags.


Used for chemical fertilizers and for production of complex fertilizers,potassium sulphate,ammonium chloride and ammonium persulpate,ect. Also can be used for food processing,textile industry,medical industry and leather processing.

Technical specifications of Ammonium Sulphate( National Standard GB535-1995)