The Global Hexamethylene Diisocyanate Market Size was worth around USD 2.16 Billion in 2024 and is Predicted to Grow to around USD 4.79 Billion by 2035 with a Compound Annual Growth Rate (CAGR) of 7.51% from 2025 to 2035. The hexamethylene diisocyanate (HDI) market is growing because the automotive and aerospace industries need high-quality coatings. The market expansion occurs because construction activities increase, technological improvements in polyurethane develop, and VOC regulations mandate the use of sustainable, strong materials.