| 1948 | April | Company is established. (Manufacturing of industrial chemicals and ammonia is started.) |
|---|---|---|
| 1952 | July | Manufacturing of IBIT (acid corrosion inhibitor), etc. is started. |
| 1958 | March | Shigino Works is established and starts manufacturing inorganic products. |
| 1959 | October | Manufacturing of liquid aluminum sulfate (LAS) is started. |
| 1964 | October | Tokyo Office in Chuo-ku, Tokyo is inaugurated. |
| 1968 | October | Hirakata Works is established and starts manufacturing inorganic products. Tokushima Works is established in Anan City, Tokushima Prefecture and starts manufacturing liquid aluminum sulfate (LAS). |
| 1969 | May | Manufacturing of poly aluminum chloride (PAC) is started in Shigino Works. |
| October | Yonago Works is established in Saihaku County, Tottori Prefecture and starts manufacturing liquid aluminum sulfate (LAS). | |
| 1975 | October | Nichinan Works is established in Nichinan City, Miyazaki Prefecture and starts manufacturing liquid aluminum sulfate (LAS) |
| 1978 | February | Manufacture and sales of cleaning agents for steel (current ASAFINE products) is started. |
| 1983 | October | Domestic business rights of IBIT are transferred to Asahi Chemical from Sumitomo Chemical Industry Co., Ltd. |
| 1985 | November | Manufacturing of SUMICERAM is started. |
| 1986 | December | Business rights (in domestic and overseas markets) of SUMICERAM are transferred to Asashi Chemical from Sumitomo Chemical Industry Co., Ltd. |
| 1988 | April | Overseas business rights of IBIT are transferred to Asahi Chemical from Sumitomo Chemical Industry Co., Ltd. |
| 1992 | July | Manufacturing technology for poly aluminum chloride is exported to Thailand. |
| 1998 | April | Niihama Works is established in Niihama City in Ehime Prefecture and starts manufacturing LUXELEN, for which business rights were transferred to Asahi Chemical from Sumitomo Chemical Industry Co., Ltd. Sales business rights of inorganic flocculant products are transferred to Asahi Chemical from Sumi- Al Product Sales Co., Ltd. |
| 2000 | July | The Shiraoi, Asahikawa, Iwanuma and Fuji Works of Koei Chemical Co., Ltd. are transferred to Asahi Chemical and start manufacturing inorganic flocculant products, etc. |
| 2003 | April | Sales rights of inorganic flocculant products are transferred to Asahi Chemical from Sumitomo Chemical Industry Co., Ltd. |
| July | Shigino Works and Hirakata Works are moved to the area of Osaka Plant of Sumitomo Chemical Industry Co., Ltd. The manufacturing facilities for poly aluminum chloride (PAC) are moved to the area of Ehime Plant of Sumitomo Chemical Industry Co., Ltd. and the PAC business is transferred to Asahi Chemical. | |
| 2004 | March | Asahikawa Works is closed. |
| April | Headquarters is moved to the current Sumitomo Fudosan Yokobori Building. | |
| 2010 | March | Heat-resistant adhesives and paints business is acquired from Nissan Chemical Industries, Ltd. |
| 2011 | March | Withdrawal from LUXELEN business. |
| 2013 | April | Business rights of liquid aluminum sulfate and sodium aluminate transferred to Asahi Chemical from Sumitomo Chemical Industry Co., Ltd. Sales of solid aluminum sulfate stopped due to withdrawal from the business by Sumitomo Chemical Industry Co., Ltd. |
| October | Tokyo Branch in Chuo-ku moved from Nihonbashikayaba-cho to Nihonbashikoami-cho. | |
| 2017 | August | Tokushima Works is changed to Tokushima Stock point due to termination of manufacturing of liquid aluminum sulfate at that location. |
| 2019 | April | Iwanuma Works is closed. |
| 2025 | April | Tokyo Branch changed its name to Tokyo Sales Office. |