Project Description

toluene diisocyanate


Item Specification Result
Purity(%) 99.5MIN 99.70%
ISOMERIC RATIO(2.4/2.6) 80/20+1.0 79.4/20.6
ACIDITY(on HCL basis)(ppm) 30MAX 6
80MAX 38

Chemical nature

This product is an isomer Mixture of 80 % 2,4- and 20 % 2,6- toluene diisocyanate (TDI).


Toluene Diisocyanate is used principally for the manufacture of polyurethane flexible foams for the furniture and automotive industries. It is also used for the production of polyurethane paints, adhesives, and textile coatings.


The delivery is by tankers and in non-returnable drums. If delivered in road tankers, the temperature during transport should be maintained between 20 °C and 40 °C. If delivered in drums, the temperature should not fall below the crystallization point. Exposure to intensive sunlight should be avoided.


TDI must be protected from moisture. Oxygen and UV-light cause discoloration which normally does not affect the processing of the material.

The ideal storage temperature is between 20 °C and 25 °C. Under these conditions and if moisture and oxygen are excluded, Toluene Diisocyanate can be stored for at least 12 months. Drums must be kept airtight. Storage tanks should be blanketed with nitrogen.

Storage at higher temperatures can lead to discoloration and to a formation of solids. These solids cannot be dissolved by heating.

Storage for longer periods under + 15 °C can lead to crystallization.

Crystallized material must be melted out by short term heating in a hot air oven. Product temperature must not exceed 40 °C. Local overheating must be avoided, as TDI will decompose with the formation of gas at temperatures above 250 °C. Rolling of the drums in a hot air oven is the recommended method of dissolving the crystals. After melting out, the contents of the drum must be thoroughly mixed.

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