Agricultural grade Purity: 21%min White powder Top manufacturer's supply Ammonium sulphate industrial ... )2SO4, Molecular Weight:132.13,Appearance: white crystals, N: 21% min;Free acid as H2SO4:0.03% max ... for chemical fertilizers and for production of complex fertilizers,potassium sulphate,ammonium chloride and ammonium persulpate,ect. Also ... and water insolubles. Ammonium sulphate 21%min white powder