2,4-Toluene diisocyanate

2,4-Toluene diisocyanate (CAS 584-84-9), commonly known as 2,4-TDI, is an aromatic diisocyanate monomer with the molecular formula C9H6N2O2. It is commercially identified under abbreviations including TDI and 2,4-DIISOCYANATOTOLUENE, and carries EC number 209-544-5.

2,4-TDI reacts with polyols through its two isocyanate groups to form polyurethane networks, making it a core building block in flexible foam production for automotive seating and furniture. It also functions as a cross-linking agent in two-component coatings and adhesives, where reaction with hydroxyl-functional resins builds chemical and mechanical resistance.

This material is supplied in industrial liquid grades and is subject to REACH regulation within the EU, including mandatory exposure controls under the 2022 restrictions on diisocyanates. Procurement requires confirmation of SDS compliance and appropriate packaging, typically in drums or ISO tank containers, with handling protocols aligned to occupational exposure limit requirements.