... code) 31022100 Inspect Standards GB535-1995 Application:1.In agriculture,used for nitrogen fertilizer.It is a kind of action ... material of making compound fertilizer 3.In chemical industry,it is for raw material in making oxydol,ammonium-alum and ammonium ... .In welding industry,used for welding agent 5.In textile industry,used for fire retardant of textile fabrics 6.In electroplating industry,used for ...