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| Aug. 1974 |
Established Dainong Petrochemical Industry Co., Ltd. |
| Oct. 1976 |
Started operation of Maleic Anhydride |
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| Nov. 1984 |
Started operation of Fumaric Acid |
| Jun. 1989 |
Expanded Maleic Anhydride production |
| Sep. 1989 |
Started operation of Tetrahydrophthalic Anhydride |
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| Apr. 1991 |
Started operation of Acrylamide |
| Jul. 1993 |
Started operation of dl-Malic Acid |
| May 1995 |
Expanded Acrylamide production |
| Dec. 1997 |
Changed the Company name to Yongsan Chemicals, Inc. |
| Sep. 1998 |
Expanded Maleic Anhydride production |
| Sep. 1999 |
Acqusition of ISO 9001 certificate |
| Dec. 1999 |
Achieved award of USD 10 million Exportation |
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| Jul. 2000 |
Established Yongsan Mitsui Chemicals, Inc. |
| Dec. 2002 |
Acquired Korea PTG Co., Ltd. |
| Nov. 2005 |
Achieved award of USD 30 million Exportation |
| Feb. 2007 |
Expanded Tetrahydrophthalic Anhydride |
| Dec. 2008 |
Expanded Acrylamide production |
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