... fertilizers and for production of complex fertilizers,potassium sulphate,ammonium chloride and ammonium persulpate,ect. Also can be used for food ... .Do not damage the packing bags.Technical specifications of Ammonium Sulphate( National Standard GB535-1995) ItemSupreme gradeFirst gradeQualified ... ≤0.005--Water insolubles,% ≤0.01--Note: When ammonium sulphate is used in agriculture,it is not necessary to ...