Hexamethylene Diisocyanate (HDI) is a chemical compound commonly used in the production of polyurethane materials. It is a colorless liquid that is highly reactive, making it valuable in coatings, adhesives, and sealants. HDI is known for its durability and resistance to chemicals, which enhances the performance of products that contain it. Due to its reactivity, HDI can pose health risks if proper safety measures are not followed. Exposure can lead to respiratory issues and skin irritation. Therefore, industries that utilize isocyanates like HDI must implement strict safety protocols to protect workers and the environment.