TDI and MDI

TDI and MDI are man-made chemicals that do not occur naturally in the environment. TDI is a clear, colorless to pale yellow liquid. MDI is a light yellow crystalline solid. TDI and MDI are used to make many household products. They combine with other chemicals to produce various polyurethanes. Some of the products made with these polyurethanes include foam for furniture cushions, carpet padding, and waterproof sealants.
TDI and MDI can be released into the air, water, and soil at places where they are made or used. TDI and MDI are extremely reactive chemicals and do not stay in the environment long. In the air, half of the TDI and MDI will be removed in less than a day. In water, TDI and MDI react rapidly to form other compounds and half will be removed within a few minutes to a few hours. These chemicals do not build up in plants or animals.