1.NPK materials 2. Its principal usage is in mining, tannery and fertilizer. It is also extensively employed as a constituent� of dyeing, electro-bath and soldering fluxes. Also it is used in galvanizing, tinning, medicine, candle making, adhesive, chromizing , precision casting , producing dry storage batteries ,storage batteries , ammonium salts, tanning leather, electroplating, photography, electrodes, adhesives
