Tangshan City Fengrun District Jiuding chemical fertilizer production limited company is the AAS Asia ammonium sulfate International Trade Union ( NGO ) Hebei Tangshan region responsible person, is the Chinese leader enterprises extrusion granulation production of ammonium sulfate, ammonium sulfate particles extrusion granulation production exported to Southeast Asian countries, such as: Thailand, Vietnam, Sri Lanka, Philippines, America, and Europe Australia, Africa and other places, the ammonium sulfate particles production using pure coked thiamine extrusion, the product quality is good, white particles, high hardness, nitrogen content in conformity with national standards GB535-1995, especially the formation of very good reputation in Southeast Asia Department of agriculture, fertilizer traders, since China has become the foreign purchasing ammonium sulfate particles preferred products.