Starting around 200,000 years ago with birch-bark tar, adhesives have played an important role in the advancement of the human species.1 The constant material innovations occurring in today’s modern society create a variety of bonding challenges for engineers, scientists and builders. Aliphatic diisocyanates (ADIs) are one solution to these challenges and play a pivotal role in the construction of buildings, vehicles and other products that improve lives.
![Runner Featuring Sole of Running Shoe](https://www.americanchemistry.com/var/site/storage/images/_aliases/image_one_column/3/7/7/1/61773-1-eng-US/runner-featuring-running-shoe.png?format=avif)
Polyurethane adhesives use ADIs in a variety of markets as a raw material to create high-strength bonds that resist color change when exposed to ultra-violet (UV) rays. These ADI-based adhesives offer a flexible and advanced bond to a wide range of substrates, which is why more than 75 percent of their applications are in the construction, packaging and transportation markets.