ITEMINDEXMEASURED VALUERESULT appearanceno visible mechanical impuritiesno visible mechanical impuritiesqualified nitrogen content(dry basis),%21.0 MIN21.1qualified water content,%0.2 MAX0.1qualified free acid(H2SO4) content,%0.03 MAX0.004qualified water-insoluble content,%0.01 MAX0.006qualified 3. Storage Store in a cool, dry, ventilated warehouse, is strictly prohibited to store with lime, cement and other alkaline substances. Forbidden to transport when sun and rain, to prevent the bags damaged. 4.Application 1) An excellent fertilizer for the soil and crops in general, make the foliage, vigorous growth, improve fruit quality and yield, strengthen crop resistance to disasters, can be used as base fertilizer, top dressing, and kind of fat. 2) Raw material of making compound fertilizer 3) In chemical industry,it is for raw material in making oxydol,ammonium-alum and ammonium chloride 4) In welding industry,used for welding agent 5) In textile industry,used for fire retardant of textile fabrics 6) In electroplating industry,used for electrobath additive 7) Ammonium sulfate can be used for making refactory material 8) Catalyst in food coloring reddish brown 9) Nitrogen source culturing microzyme in making fresh yeast 10) Dyeing auxiliaries of acid dyes 11) Deliming agent of leather 12) Ammonium sulfate also can be used for beer making 13) Chemical agent 14) Storage battery making,etc