We are Hengnan ShengLong chemical co., ltd .ba . We were founded on September 8, 1999, located in Hengyang high and new development zone of Hunan. The company nears to Xiangjiang River, Beijing-Zhuhai and Hengyang-Kunming Expressway, Beijing-Guangzhou and Hunan and Guangxi Railway with convenient transportation. We are exporting chemical many years .The main products are : Sodium bicarbonate, Barium carbonate, Thiourea, Manganese sulfate Zinc sulfate mono Zinc sulfate heptahydrate We...