| 1968 --- | Established as a fine chemical plant of Chuo |
| Kaseihin Co.,INC. at Ageo,Saitama. | |
| 1980 --- | CS Kaseihin Co., was established as a specialist |
| of Phosgenation in Higashinagahara plant of Showa Denko K.K. |
|
| 1982 --- | Ageo plant became an independent company as |
| CK Fine Chemicals Co., Inc, | |
| 1990 --- | CK Fine Chemicals and CS Kaseihin merged into |
| Chuo Chemical Co., Inc. | |
| 1995 --- | Transferred a multipurpose plant from Ageo plant to |
| Higashinagahara plant. | |
| 1998 --- | Ageo Plant acquired ISO 9002. |