| April, 1967 | "Kansai Kagaku Kogyo-sho" was established as an associate plant of the Sekisui Blow Seikei Co., Ltd. (present Sekisui Seikei Kogyo Co., Ltd.) |
| 1972 | The sales and processing of recycled raw material of synthetic resin started. |
| 1980 | The deal in the substandard olefin resin materials started |
| 1981 | The deal in the regular materials of olefin and styrene resins started |
| 1983 | The deal in the substandard engineering plastics started. |
| 1984 | The deal in the regular materials of engineering plastics started. |
| October, 1987 | "Kansai Chemicals Co., LTD" was established to reinforce the sales. "Kansai Kagaku Kogyo-sho", the company's forerunner, continued to exist as a manufacture division in Kansai Chemicals. |
| 1989 | An extrusion sheeting line was established, and the manufacturing and the sales of low ratio expansion sheet started. |
| 1991 | Import and export of synthetic resin materials started. |
| 1995 |
The sales of landscaping related materials as well as the general civil engineering and construction materials started. |
| May 1996 | The main plant (and warehouse) completed. |
| 1997 | The planning and manufacturing of landscaping related materials began. |
| November 1998 | Exhibition center for the landscape creation business completed. |
| January 1999 | Okayama Sales Office opened. |
| Jury 1999 | Singapore Representative Office opened. |
| April 2000 | Nagoya Representative Office opened. |
| August 2001 | Nagoya Representative Office was reorganized as Nagoya Sales Office. |
| August 2001 | KANSAI KAGAKU (S) PTE.LTD, a local corporation in Singapore, was established. |
| October 2001 | Kashiba Factory was inaugurated |
| November 2001 | Approved as a general building contractor. |
| December 2002 | Nantong Kansai Chemicals Co., LTD a local corporation in China, obtained the commercial license to start production in April 2004. |