DAIICHI KIGENSO KAGAKU KOGYO CO., LTD. was established.
|April 1960||Opened Yodogawa Plant No. 1 in Osaka.|
|1961||Started development and sale of optical zirconia.|
|1964||Started development of rare earth elements.|
|June 1966||Established Yodogawa Plant No. 2 in Osaka.|
|June 1967||Opened the Itami Plant in Hyogo.|
Started the sale of zirconia for electronic materials and flame retardants for resin.
|April 1969||Opened the Tokyo Office.|
|1969||Started the sale of zirconia for refractories on a full scale.|
Started the sale of zirconia for brakes.
Started the sale of zirconia for oxygen sensors.
|May 1979||Established a new plant on the premises of the Head Office in Suminoe, Osaka and integrated the three existing plants into it.|
|1980||Started the sale of electromelting zirconia for continuous casting of steel on a full scale.|
Started the sale of zirconia for fine ceramics.
|April 1984||Established an affiliated company, NewTechs Co., Ltd.|
Started the sale of zirconia for catalysts for purifying vehicle emissions and complex oxide of ceria.
|1992||Acquired a patent and sales right for colored zirconia from Nippon Soda Co., Ltd.|
|March 1993||Established a joint company, I. D.U. Co., Ltd.|
|January 1996||Obtained ISO-9001 certification. (JQA-1144)|
Established the Gotsu Plant in Shimane.
|1997||Started the sale of cesium flux-containing cored wires and rings.|
Yttria-stabilized zirconia and scandia-stabilized zirconia were employed as electrolyte materials for solid-oxide fuel cells.
|2000||Started the sale of zirconia for dental materials.|
|February 2001||Obtained ISO-14001 certification (JQA-EM-1307).|
|September 2002||Absorbed an affiliated company, New Techs Co., Ltd.|
|December 2004||Listed on the Second Section of the Tokyo Stock Exchange.|
|2005||Started the sale of zirconia for rechargeable batteries.|
Established the Fukui Plant in Fukui.
|March 2012||Established a subsidiary, Vietnam Rare Elements Chemical Joint Stock Company, in Vietnam.|
|August 2013||Established a subsidiary, Suihua Shanghai Trading Company Limited (predecessor of DKK (Shanghai) Materials Trading Co., Ltd.), in China.|
|July 2014||Established equity method subsidiaries, Shandong Guangyin DKK New Materials Co., Ltd. and Shandong Guangyin DKK Environment Technology Co., Ltd., in China.|
|September 2017||Established DKK Logistics Corporation.|
|March 2018||Established a subsidiary, DKK Thai Materials Trading Co., Ltd., in Thailand.|
|June 2018||Listed on the First Section of the Tokyo Stock Exchange.|
|March 2019||Moved the Head Office to Chuo-ku, Osaka.|
|June 2019||Established a subsidiary, DKK America Materials,Inc.,in USA.|
|February 2021||Moved the Tokyo Office to Chiyoda-ku, Tokyo.|