Diisocyanates are a group of chemical compounds that contain two isocyanate functional groups. They are primarily used in the production of polyurethanes, which are versatile materials found in products like foams, coatings, and adhesives. Common diisocyanates include toluene diisocyanate (TDI) and methylenediphenyl diisocyanate (MDI). These compounds are known for their reactivity and can pose health risks if inhaled or if they come into contact with skin. Proper safety measures, such as using protective equipment and ensuring good ventilation, are essential when working with diisocyanates to minimize exposure and potential health effects.