Toluene diisocyanate TDI-100 is one that contains 2,4-TDI100%. It is a colorless liquid and is an uncommon polyurethane raw material. Although toluene diisocyanate is included in the list of 2B carcinogens, TDI is an important raw material for industrial polyurethane, foam and other chemical products, which can be guaranteed safe if handled properly.