Zhejiang Tianshi Nano-Tech Co., Ltd. was founded in the reign of Xianfeng of Qing Dynasty. After nearly two centuries of hard working, Zhejiang Tianshi Nano-Tech Co., Ltd. has grown into a leading enterprise of Calcium carbonate industry of China. We were recognized as a national high-tech enterprise in 2008 and become a group leader unit of Calcium carbonate working group of Inorganic Chemicals Branch of National Chemical Standardization Technical Committee in 2009. As a hi-tech research, production and trade enterprise established on joint-stock system,...