Tianjin Topfert Agrochemical Co., Ltd was founded in 2012, the factory is located in Tangqu Distrit Tianjin with its area around 20000 meter. Specializing in the production of magnesium sulfate and ammonium sulfate. Magnesium sulfate: output capacity: 300,000mt/year. Ammonium sulfate: output capacity: 200,000mt/year.