History
| May 1956 |
DAIICHI KIGENSO KAGAKU KOGYO CO., LTD. was established.
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|---|---|
| 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 Itami Plant in Hyogo. |
| 1968 |
Started the sale of zirconia for electronic materials and flame retardants for resin.
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| April 1969 | Opened Tokyo Office. |
| 1969 | Started the sale of zirconia for refractories on a full scale. |
| 1972 |
Started the sale of zirconia for brakes.
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| 1976 |
Started the sale of zirconia for oxygen sensors.
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| May 1979 | Established a new plant on the premises of 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. |
| 1981 |
Started the sale of zirconia for fine ceramics.
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| April 1984 | Established an affiliated company, NewTechs Co., Ltd. |
| 1986 |
Started the sale of zirconia for catalysts for purifying vehicle emissions and complex oxide of ceria.
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| 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) |
| July 1996 |
Established Gotsu Plant in Shimane.
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| 1997 | Started the sale of cesium flux-containing cored wires and rings. |
| 1998 |
Yttria-stabilized zirconia and scandia-stabilized zirconia were employed as electrolyte materials for solid-oxide fuel cells.
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| 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. |
| October 2006 |
Established Fukui Plant in Fukui.
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| 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 Head Office to Chuo-ku, Osaka. |
| June 2019 | Established a subsidiary, DKK America Materials,Inc.,in USA. |
| February 2021 | Moved Tokyo Office to Chiyoda-ku, Tokyo. |
| April 2022 | Transition to the Prime Market in the Tokyo Stock Exchange. |
| May 2022 | Started Midterm Management Plan "DK-One Next" |
| August 2023 | Constructed a new factory, VIETNAM RARE ELEMENTS CHEMICAL JOINT STOCK COMPANY, in Vietnam. |
| August 2023 | Established R&D Center in Osaka. |
| April 2024 | Renamed Osaka Site to R&D Center. |
