Hexamethylene Diisocyanate (HDI)

Last Updated: January 27, 2020

Definition - What does Hexamethylene Diisocyanate (HDI) mean?

Hexamethylene diisocyanate (HDI) is a colorless liquid typically used as a polymerizing agent in paints and coatings. It is an organic compound with the chemical formula (CH2)6(NCO)2. HDI is used in the formulation of specialty products, such as abrasion- and UV-resistant coatings. As such, HDI is typically found in coatings applied to the exterior of equipment, such as marine vessels and aircraft.

Hexamethylene diisocyanate is also known as monomeric aliphatic diisocyanate.

Corrosionpedia explains Hexamethylene Diisocyanate (HDI)

In addition to coatings, hexamethylene diisocyanate is also used for the preparation of dental materials, contact lenses and medical adsorbents. Its use in chemical synthesis is due mainly to its ability to produce products with exceptional weathering resistance and flexibility.

Short-term exposure to hexamethylene diisocyanate can lead to a variety of health problems such as pulmonary edema, coughing and shortness of breath. Studies have also found that long-term exposure may cause chronic lung problems.

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