Zhejiang Chang An Renheng Technology Co., Ltd. engages in the provision of fine chemicals. Its activities include research and development, production and sale of bentonite fine chemicals. It offers products such as papermaking chemicals, bentonite for metallurgy pellet, calcium-bentonite and others. The papermaking chemicals consist of retention and drainage aids, deinking aids, deinking agent, water purifying agent and dry strength agent. The Bentonite for metallurgy pellet is used in iron smelting and making bulk iron powder into smelted granular materials to bind iron ore powder. The Calcium-bentonite is adopted as animal feed additives and further processed into high-pressure bentonite which is used as a raw material in the pharmaceutical industry. The company was founded by You Lian Zhang, Yuan Ye Zhang, and Zhong Yi Wu on December 4, 2000 and is headquartered in Huzhou, China.