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US MDI (Methylene Diphenyl Diisocyanate) Polymeric Grade rose by 5.86%for the week ending March 20, 2026. Prices strengthened amid rising feedstock benzene costs, driven by geopolitical tensions and higher crude oil values, which increased overall production expenses. In the U.S., supply-demand dynamics tightened as global MDI supply fell by 15% in Q1 due to maintenance shutdowns, while demand improved with a rebound in construction and insulation sectors. Covestro Inc. raised prices by $0.10/lb (~$220/ton) effective March 1, alongside volume restrictions, while Huntsman implemented a $260/ton hike, reinforcing bullish sentiment. Trade flows shifted significantly, with U.S. imports from China dropping to just 27 tonnes in March due to tariffs, while total imports declined to 10,900 tonnes from 35,500 tonnes a year earlier, increasing reliance on European supply. Globally, BASF announced a $500/ton increase in East Asia, and Wanhua declared force majeure in the Middle East. Tight spot availability and pre-season restocking supported firm pricing, with expectations of further upward momentum.