Abstract
The effect of water vapor on atmospheric toluene diisocyanate was determined quantitatively. At 24° C and atmospheric pressure a maximum reduction of 50% was obtained for initial TDI concentrations of 0.4 and 0.034 ppm. The percentage reduction of TDI depended almost solely on the water vapor concentration. The data suggest that increased humidity would be only marginally useful as a control method. They do, however, emphasize the need for sensitive analytical procedures to measure both TDI and the TDI urea around the TLV of 0.02 ppm.