Toluene Diisocyanate CAS#26471-62-5
Toluene diisocyanate (TDI) is an aromatic diisocyanate that appears as a clear to pale yellow liquid with a sharp, pungent odor. It is insoluble in water but miscible with most commonly used organic solvents.
TDI (CAS No. 26471-62-5) is composed of two isomers: toluene-2,4-diisocyanate (2,4-TDI, CAS No. 584-84-9) and toluene-2,6-diisocyanate (2,6-TDI, CAS No. 91-08-7). Commercial TDI is available in different isomer ratios, with the most common composition being 80% 2,4-TDI and 20% 2,6-TDI. TDI is widely used in the chemical industry and has historically represented a significant share of the global isocyanate market.
Toluene diisocyanate Chemical Properties
| Melting point | 19.5~21.5℃ |
| Boiling point | 247℃ |
| density | 1.22 |
| vapor pressure | 0.03 hPa ( 20 °C) |
| refractive index | 1.5660 to 1.5700 |
| Fp | 137 °C |
| storage temp. | Store below +30°C. |
| solubility | miscible with Ether,Acetone,Benzene |
| form | clear liquid |
| color | Colorless to Light yellow |
| Odor | Sharp, pungent odor |
| explosive limit | 0.9-9.5% (v/v) |
| Water Solubility | 124mg/L at 25℃ |
| InChI | 1S/C9H6N2O2/c1-7-2-3-8(10-5-12)4-9(7)11-6-13/h2-4H,1H3 |
| InChIKey | DVKJHBMWWAPEIU-UHFFFAOYSA-N |
| SMILES | N(=C=O)c1c(ccc(c1)N=C=O)C |
| LogP | 3.43 at 22℃ |
| CAS DataBase Reference | 26471-62-5(CAS DataBase Reference) |
| IARC | 2B (Vol. 39, Sup 7, 71) 1999 |
| EPA Substance Registry System | Toluene diisocyanate (26471-62-5) |
| Risk Statements | 26-36/37/38-40-42/43-52/53 |
| Safety Statements | 23-36/37/39-45-24/25 |
| RIDADR | 2078 |
| WGK Germany | WGK 2 |
| RTECS | NQ9490000 |
| Autoignition Temperature | 620°C |
| TSCA | TSCA listed |
| HazardClass | 6.1(a) |
| PackingGroup | II |
| HS Code | 29291090 |
| Storage Class | 6.1A - Combustible, acute toxic Cat. 1 and 2 |
| very toxic hazardous materials | |
| Hazard Classifications | Acute Tox. 1 Inhalation |
| Aquatic Chronic 3 | |
| Carc. 2 | |
| Eye Irrit. 2 | |
| Resp. Sens. 1 | |
| Skin Irrit. 2 | |
| Skin Sens. 1A | |
| STOT SE 3 | |
| Hazardous Substances Data | 26471-62-5(Hazardous Substances Data) |
| Toxicity | A designated hazardous waste (EPA). It is a colorless to yellow solid, melting at about 20°C. TDI and MDI (diphenylmethane diisocyanate) are used in the manufacture of polyurethane foams by reaction with polyhydroxy compounds. These foams are used for insulation, upholstering, etc. Exposure is commonly by inhalation of the vapor. Both TDI and MDI can cause irritation of eyes and mucous membranes, in severe cases leading to pulmonary edema. Sensitization to TDI is common and frequently rapid, leading to an allergic reaction and some loss of lung function. In the United Kingdom, the threshold limit value is 0.02 ppm for not more than 20 min, or 0.005 ppm for 8 h. |
Product Application of Toluene Diisocyanate CAS#26471-62-5
The isocyanate functional groups in TDI react with hydroxyl groups to form urethane linkages, making it an important raw material for the production of flexible polyurethane foams used in furniture, bedding, automotive seating, and commercial transportation seating.
Other applications include polyurethane elastomers for automotive bumper covers, industrial rollers, sporting footwear, and various mechanical products. TDI is also used in the production of coatings, including metal coatings, wood coatings, and high-performance anticorrosive coatings.
TDI-based rigid polyurethane foam is used in household refrigerators and residential construction applications such as sheathing and commercial roofing. Spray-applied rigid polyurethane foam based on TDI can also serve as insulation for truck trailers, railroad freight cars, and overseas cargo containers. In addition, moisture-curing TDI coatings are used as sealants and floor finishes for wood and concrete surfaces.
