Toluene diisocyanate, the TDI, exists in two isometric forms (2,4-toluene diisocyanate and 2,6-toluene diisocyanate) which have similar effects and properties. At room temperature, TDI is a clear yellow liquid with a sharp, pungent odor. IT should be stored in a tight closed container, away from light, under refrigeration and inert atmosphere. TDI can be used in polyurethane foams, coatings in floor and wood finishes, sealers, paints, concrete sealers for aircraft and tank trucks, elastomers in clay pipe seals, elastomers and coatings, and crosslinking agent for nylon. TDI results in severe irritation of the skin and eyes and affects the respiratory, gastrointestinal, and central nervous systems (CNS) in human by inhalation.