What are polyurethanes?

 

Polyurethane is any polymer—a large molecule of repeating structural units—composed of a chain of organic units, joined by urethane links. It includes natural and synthetic materials with a variety of properties. Polyurethanes are the most versatile of all the polymers and can be made liquid, rigid, pliable and stretchable, and can be spread, sprayed or molded.

 

Polyurethanes are available in a number of forms, like rigid and flexible foams, chemical coatings, specialty adhesives and sealants, and elastomers, which can be molded into any shape.

 

When where they invented?

 

The development of polyurethanes dates back to the middle of the twentieth century, when it was designed to replace rubber. Once its potential was explored and understood, its properties have propelled it to applications in almost every industry ever since.