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About Us

KUNIMINE INDUSTRIES CO., LTD. is committed to promoting research and development in pursuit of new applications by exploring the science of clay with the mining, processing, and selling of bentonite as our main business. Here we introduce basic knowledge about bentonite, which is the core of our business, as well as our products and technologies that support people’s daily lives.

Abount Bentonite

Here, we introduce basic knowledge about bentonite. Bentonite is a rock composed mainly of clay minerals and montmorillonite. We explain the properties of bentonite used in various industrial fields in an easy-to-understand way.

Our Business Activities

Bentonite is called a clay with 1,000 applications and it is utilized in our daily lives. Here, we introduce our products and technologies that support our living with illustrations in an easy-to-understand way.

Research & Development

We promote the development of new applications by combining six core and sub-technologies that take advantage of the properties of clay. Each laboratory conducts evaluation tests and analyses in specialized fields related to bentonite on commission.


Here, we introduce our products KUNIPIA and SUMECTON. KUNIPIA is a high-purity clay material that contains no impurities of natural bentonite. SUMECTON is clay produced by chemical synthesis that addresses the unevenness of natural clay.