Toluene diisocyanate
CAS Number
26471-62-5
EC Number
247-722-4
Abbreviation
TDI
What is Toluene diisocyanate?
Toluene diisocyanate (CAS 26471-62-5), commonly traded as TDI, is a reactive diisocyanate monomer used to produce polyurethane polymers through reaction with polyols.
Where is Toluene diisocyanate used?
- Flexible polyurethane foam: reacts with polyether polyols for furniture cushioning and mattresses
- Automotive seating
- Coatings and adhesives: cross-linking agent improving hardness, chemical resistance and adhesion in two-component systems
- Sealants and elastomers: TDI-based prepolymers for construction joints, industrial rollers and conveyor components
- Tire and rubber industry: curing agent in specialty rubber compounds
- In flexible foams, coatings and adhesives it serves as a foundational building block.
Commercial specifications
- Liquid in two commercial isomer blends: TDI-80/20 and TDI-65/35
- TDI-80/20 dominant industrial grade: 80% 2,4- and 20% 2,6-isomer
- Drum and ISO tank quantities
- Technical grade standard market specification, purity typically above 99%
Other Names (Synonyms)
tolylene diisocyanate|TDI|Benzene, 1,3-diisocyanatomethyl-|Isocyanic acid, methyl-m-phenylene ester|1,3-Diisocyanatomethylbenzene|TOLUENE DIISOCYANATE TDI 80/20
What are the physical properties of Toluene diisocyanate?
Melting Point 20 °C
Boiling Point 251 °C
Density 1.22 g/cm³ @ Temp: 25 °C
Flash Point 137 °C
Appearance Toluene diisocyanate is a colorless, yellow, or dark liquid or solid. It has a sweet, fruity, pungent odor. Toluene diisocyanate (technical, 26471-62-5) is an 80: 20 mixture of 2,4-and 2,6-isomers. A solid above 71/F/22℃. The Odor Threshold is 0.4-2.14 ppm.
Color Colorless to Light yellow
Odor Sharp, pungent odor
Form clear liquid
Water Solubility 124mg/L at 25℃
Vapor Pressure 0.03 hPa ( 20 °C)
Refractive Index 1.5660 to 1.5700
Log P 3.43 at 22℃
Which trade and regulatory codes apply to Toluene diisocyanate?
HS Code 29291090
Storage Class 6.1A - Combustible, acute toxic Cat. 1 and 2
very toxic hazardous materials
WGK (Germany) 2