| 1956 |
- Construction of Kawasaki Plant was completed and production started.
|
| 1959 |
- Purification and Analysis Process for super-pure carbon dioxide to be used for nuclear power plant were developed under Science and Technology Agency Grant.
|
| 1962 |
- The company was listed on the Second Section of the Tokyo Stock Exchange Market.
- Showa Dry Ice Hanbai Company (the forerunner of Shotan Shoji Kaisha) was established.
- Low temperature storage tanks were developed for large volume transportation system for liquid carbon dioxide.
|
| 1968 |
- Construction of Yokkaichi Plant started in industrial complex shared with Daikyo Oil.
|
| 1978 |
- Plant for manufacturing liquid carbon dioxide was completed at Kyushu Oil Company (the forerunner of JXTG Nippon Oil & Energy Corporation) , Oita oil refinery complex.(Showa Tansan Co.,Ltd. has contract to take entire output)
|
| 1980 |
- Plant for manufacturing liquid carbon dioxide was completed at Kinki Ekitan Company, Osaka Senboku Works.
|
| 1982 |
- Plant for carbon dioxide was constructed at Japan Energy Company (the forerunner of JXTG Nippon Oil & Energy Corporation) , Mizushima oil refinery.(Showa Tansan Co.,Ltd. has contract to take entire output)
|
| 1990 |
- Distibutorship Agreement for Blasting System was made with Cold Jet, Inc., U.S.A.
|
| 1996 |
- Technical & Development Center was constructed at Kawasaki Plant.
|
| 1997-1998 |
- Both Kawasaki & Yokkaichi Plant registered Certificate of ISO 9001.
|
| 1999 |
- Both Kawasaki & Yokkaichi Plant registered Certificate of ISO 14001.
|
| 2003 |
- The first overseas subsidiary company "Siam Showa T & T Co., Ltd." was established in Bangkok, Thailand.
|
| 2004 |
- Both Dry Ice & Liquid Carbon Dioxide manufacturing were started at Osaka Tansan K.K., Osaka Senboku Works.
|
| 2007 |
- "Showtan Techno-Machine Nanjing Co., Ltd." was established in Nanjing, China.
|
| 2008 |
- Showa Tansan Co., Ltd. become a consolidated subsidiary of Showa Denko K.K..
|
| 2009 |
- The company tied up with Showa Denko K.K. and developed sales of industrial gases.
- Showa Tansan Co., Ltd. become a wholly owned subsidiary of Showa Denko K.K..
|
| 2012 |
- Showa Tansan Co., Ltd. changed its name to "Showa Denko Gas Products Co., Ltd." on January 1, 2012.
- Showa Denko Gas Products Co., Ltd. has taken over the rights and obligations pertaining to SDK's industrial gas business on an absorption-type split agreement.
|
| 2019 |
- Construction of Oita Plant was completed and production started.
|
| 2021 |
- Started the operation of ISO containers for the first time in Japan which is able to fill liquefied carbon dioxide domestically. Transport liquefied carbon dioxide in large quantities between plants.
|
| 2023 |
- Showa Denko Gas Products Co., Ltd. changed its name to "Resonac Gas Products Corporation" on January 1, 2023.
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