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Ammonium sulfate professional manufacturers Main Products: Ammonium Sulphate,Zinc Sulphate,Magnesium Sulphate,Kieserite,Ferrous Sulfate Manager: eric@crownchampion.com Tel:86-22-59816668 Website:http://www.topfert.net http://www.crownchem.net/ Tianjin Crown Champion Industrial Co.,Ltd was established in 2000，mainly devotes toammonium sulphate granular and magnesium sulphate researching, developing and producing, as well as other fertilizers and chemicals exporting. Our factory Tianjin Topfert Agrochemical Co.,Limited, invested and established in 2002, mainly manufactures Ammonium Sulphate granular with yield of 50,000mts per year ,50,000mts Kieserite (Magnesium Sulphate) per year and 30,000mts Zinc Sulphate per year.