Toluene Diisocyanate

Toluene Diisocyanate

CAS Number:26471‑62‑5 (also 584‑84‑9 for 2,4‑TDI and 91‑08‑7 for 2,6‑TDI)

Synonyms:TDI; 2,4‑TDI; 2,6‑TDI; polyisocyanate

Chemical Formula:C₉H₆N₂O₂

Product Introduction

A colorless to pale-yellow liquid with a sharp, pungent odor. Typically sold as an 80/20 or 65/35 mixture of 2,4‑ and 2,6‑isomers. Essential in polyurethane production, especially for flexible foam, elastomers, coatings, and adhesives.

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Physical & Chemical Properties

Property Value
Appearance Clear to light yellow liquid
Odor Strong, pungent, irritating
Specific Gravity ~1.22 @ 25 °C
Boiling Point ~250–254 °C
Melting/Freezing Pt. ~14 °C for 80/20 mix; 2,4‑TDI: ~21 °C
Vapor Pressure 0.025 mmHg @ 25 °C (mix)
Vapor Density ~6× air
Flash Point >110 °C (DIN)
Solubility Insoluble in water (reacts); soluble in common organics

Applications

  • Foundations for polyurethane products: flexible foams (furniture, automotive), elastomers (soles, upholsteries), coatings, adhesives, sealants.
  • Used in crosslinkers, tank liners, insulation foam, and certain epoxy resins.

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