Chronology
| February 1904 | The Company launches its chemical sales business as the Hayashi Matakichi Store at Doshomachi in Higashi-ku (currently Chuo-ku), Osaka.
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| April 1932 | The privately-run Hayashi Matakichi Store is incorporated. |
| The Hayashi Matakichi Store is renamed Hayashi Chemical Retail Co., Ltd. | |
| August 1950 | A new manufacturing plant (the former Joto Plant) is established in Higashinakahama, Joto-ku, Osaka.
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| October 1952 | Hayashi Chemical Retail Co., Ltd. is renamed Hayashi Pure Chemical Ind., Ltd. |
| February 1965 | The Head Office is relocated to 2-2 Doshomachi Higashi-ku (currently Chuo-ku), Osaka. |
| September 1971 | The Tokyo Sales Office is opened in Nihonbashihongokucho, Chuo-ku, Tokyo. (It is later relocated to Nihonbashihoncho, Chuo-ku, Tokyo.) |
| October 1983 | The Kyushu Sales Office is opened in Hikino, Yahatanishi-ku, Kitakyushu-shi, Fukuoka. (It is later relocated to Ushizucho, Ogi-shi, Saga.) |
| April 1984 | The Saga Sales Office is opened in Takucho, Taku-shi, Saga. (It is later relocated to Ushizucho, Ogi-shi, Saga.) |
| April 1985 | The Electronic Materials Department is launched. The Company begins manufacturing chemicals for the electronics industry. |
| March 1990 | The Saga Plant is completed in Ushizu Industrial Park in Ogi-gun (currently Ogi-shi), Saga.  |
| July 1995 | The Mie Plant is completed in Taki-cho, Taki-gun, Mie.
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| March 1997 | The Head Office is relocated to 3-2-12 Uchihiranomachi, Chuo-ku, Osaka.
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| August 1998 | The Mie Plant acquires ISO 9002 certification. |
| October 1999 | The Saga Plant acquires ISO 9002 certification. |
| April 2001 | The Tottori Plant is completed in Ketaka-cho, Ketaka-gun (now Tottori-shi), Tottori.
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| March 2002 | HPC acquires ISO 14001 certification. |
| August 2002 | The Nara Office is completed in Nukatabe-Kitamachi, Yamatokoriyama-shi, Nara. |
| April 2004 | The Mie Sales Office is opened in Taki-cho, Taki-gun, Mie. |
| August 2004 | HPC acquires ISO 9001 certification. |
| June 2005 | The Techno Center is opened in Taki-cho, Taki-gun, Mie.
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| May 2011 | The Logistics Center is opened in Nishiawaji, Higashiyodogawa-ku, Osaka. |
| March 2019 | Reagent Direct, an online reagent sales site, begins operation. |
