| 1964 | Nihon Extron Co., Ltd. established in Omori-Nishi, Ota-ku, Tokyo. |
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| 1985 | Opened Souka plant in Hanaguri, Soka City, Saitama Prefecture. |
| 1998 | Started production of hollow bars. |
| 2002 | ISO9001 certified. |
| 2003 | Kureha Chemical Industry Co., Ltd. invested. |
| 2004 | Headquarters and factory moved to Showajima, Ota-ku. ISO14001 certificated. |
| 2013 | Kureha Corporation's capital ratio increased to 100%. |
| 2014 | Merged Kurefine Co., Ltd. Changed company name to Kureha Extron Co., Ltd. |
| 2019 | Business integration with Kureha Extech Co., Ltd. |
| 1963 | Established Sanko Plastics Co., Ltd. in Dejima Village, Ibaraki Prefecture (now Kasumigaura City). Kureha Chemical Industry Co., Ltd. invested. |
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| 1992 | Started production of KFC film. |
| 1999 | ISO9001 certified. |
| 2005 | Production of KF piezo sheet stock started. Company name changed to Kureha Extech Co., Ltd. |
| 2007 | ISO14001 certified. |
| 2009 | Started production of KF compound, a fluororesin. |
| 2019 | Management integration with Kureha Extron Co., Ltd. as the surviving company. |