Polyurethane (PUR + PU) is a polymer composed of a chain of organic units joined by carbamate (urethane) links.
While most polyurethanes are thermosetting polymers that do not melt when heated, thermoplastic polyurethanes are also available.
Often simply called “urethanes”, but should not be confused with ethyl carbamate, which is also called urethane. Polyurethanes neither contain nor are produced from ethyl carbamate.
Polyurethanes are used in the manufacture of microcellular foam seals and gaskets; durable elastomeric wheels and tires; automotive suspension bushings; electrical potting compounds; high performance adhesives; surface coatings and surface sealants; and hard-plastic parts (i.e., for electronic instruments).
Also used for the manufacture of hoses and skateboard wheels as it combines the best properties of both rubber and plastic.