Yongsan Chemicals, Inc. is a joint venture by and among Yongsan International Inc. of Korea, and Mitsui Chemicals, Inc.,
Yongsan Chemicals, Inc. is manufacturing Maleic Anhydride, which is mainly used in various structural resins, and its derivatives which are Fumaric Acid, Tetrahydrophthalic Anhydride, and DL-Malic Acid for both food and industrial uses. Another major product is Acrylamide that is used in water treatment flocculant and recycled paper strengthener.