Dow to build MDI distillation and prepolymers facility 6/9/2021 Dow plans to build an integrated MDI distillation and prepolymers facility at its world-scale manufacturing site in Freeport, Texas. This investment supports increasing demand for downstream polyurethane systems products and advances Dow’s leading positions in attractive applications in construction, consumer, and industrial markets that are growing above GDP. The new Freeport MDI facility will replace Dow’s current North America capacity in La Porte, Texas, and will also be capable of supplying an additional 30% of product to Dow’s customers. In coordination with the start-up of the new MDI facility, expected in 2023, Dow will shut down its polyurethane assets at the La Porte site.