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Toluene Diisocyanate (TDI) is an aromatic compound commonly used in the production of polyurethane foams, coatings, adhesives, and elastomers. It is a colorless to pale yellow liquid with a strong, pungent odor. TDI is known for its reactivity and ability to form strong bonds with various materials, making it a valuable component in the manufacturing industry.
TDI is typically produced in two forms: TDI 80/20 and TDI 65/35. The numbers indicate the ratio of the two isomers, 2,4-toluene diisocyanate (2,4-TDI) and 2,6-toluene diisocyanate (2,6-TDI), present in the product. The 80/20 and 65/35 ratios are the most commonly used compositions.
| Property | Specification |
|---|---|
| CAS Number | 26471-62-5 |
| Molecular Formula | C9H6N2O2 |
| Appearance | Clear liquid |
| APHA Color (max) | 25 |
| Specific Gravity (at 20°C) | 1.22 ± 0.02 |
| Purity (% by wt., min) | 99.7 |
| Isomer Content (% by wt.) | |
| 2,4 TDI | 80 ± 1 |
| 2,6 TDI | 20 ± 1 |
| Total Acidity (ppm by wt, max) | 40 |
| Hydrolyzable Chlorine (ppm by wt, max) | 80 |
| Total Chlorine (ppm by wt, max) | 700 |
| UN No. | 2078 |
| Haz. Class | 6.1 |
| IMDG Code Page | 6269 |