Isophorone diisocyanate (TDI) is an organic compound. It is a colorless to pale yellow liquid with a pungent and irritating odor at room temperature.

Isophorone diisocyanate is mainly used to produce polyurethane materials, such as polyurethane foam, polyurethane elastomer, plastics and coatings. Polyurethane materials have excellent physical properties and chemical stability, and are widely used in fields such as construction, automobiles, furniture, and footwear.