Zhejiang Chang’an Renheng Technology Co., Ltd is founded in Dec. 2000, and the registered capital is RMB 38 million. We are new high-tech enterprise and principally engaged in the research, manufactory, sales and technical service of bentonite fine chemicals. We have 13 patents for invention and we build a complete set of quality management system, also Passed ISO 9001: 2008 quality management certification. And we were listed in Hong Kong stock exchange market in Jan. 2015. Zhejiang Chang’an Renheng Technology Co., Ltd is a professional deep fine bentonite resources service provider, the goal is to become the world's top quality bentonite production supplier.