Chongqing Xianfeng Strontium(Sr) Salt Chemical Co., Ltd.a Sino-Japan joint venture established in 1995, is China's earliest pillar and leading enterprise engaged in the fine chemicals ( strontium,barium, manganese) area. And our company has been invited for many times by the related national authorieites to participate in the constitution and drafting of National Standards for manganese chloride tetrahydrate,manganous nitrate and strontium chloride hexahydrate etc.