... about our company:Established in 2004, Changsha Zhenfan Chemicals Industry and Trading Co., Ltd. is located in Changsha, Hunan province, China.We ... , magnesium sulfate, zinc oxide, sodium metabisulfite, phosphoric acid and copper sulfate. According to the principle of mutual benefit, we ... strong belief of "good quality, favorable price and best service", and try our best to satisfy all customers.We ...