This project was aimed at expanding the annual methylene diphenyl diisocyanate (MDI) production capacity of Kumho Mitsui Chemicals’ plant in Yeosu National Industrial Complex from 200,000 tons to 340,000 tons. MDI is a key material for polyurethane, which is applied to a variety of products ranging from refrigerators to building materials, interior and exterior finishing materials for automobiles, and synthetic leather. POSCO E&C completed this turn-key project in October 2017 by comprehensively handling the EPC and commissioning support operations.