Ammonium sulphate(Industrial premium grade) Pharmaceutical:

Appearance:       

White crystal without visible mechanical impurities

Nitrogen content(N):     

21.0%         min

Water content(H2O):   

0.2%           max

Free acid(H2SO4):       

0.03%         max

Iron(Fe):                 

0.007%       max

Arsenic(As): 

0.00005%   max

Heavy metal(based on Pb):   

0.005%       max

Insoluble substance in water:

0.01%         max

                                             Ammonium sulphate(Industrial first grade):

Appearance:    

Without visible mechanical impurities

Nitrogen content(N):   

21.0% min

Water content(H2O): 

0.3%   max

Free acid(H2SO4):

0.05% max

                                             Ammonium sulphate(Agriculture grade):

Appearance: 

Without visible mechanical impurities

Nitrogen content(N):

20.5% min

Water content(H2O): 

1.0%max

Free acid(H2SO4):

0.2%max