US polymeric MDI prices are expected to rise sharply in June 2026, driven by fresh supply disruptions and the tightening trend that emerged in late May. Covestro’s Baytown force majeure (June 1–10) and Huntsman’s Geismar maintenance shutdown (June 1–10) will temporarily remove significant volumes from a highly concentrated North American market, where a few producers control 95% of capacity. With global offline capacity still elevated, June spot availability is expected to be extremely limited. Late May provided a clear signal of what lies ahead: spot MDI surged in the week ending May 31 after mid month outages at Covestro and Dow tightened supply. Downstream demand remains subdued, but in a tight MDI market, supply disruptions outweigh weak consumption. As June begins under dual outages, prices are forecast to remain firm to bullish throughout the month.
