Polyurethanes are a versatile class of polymers that are widely used in various industries due to their extreme toughness, chemical resistance, and elasticity. As such, there are several synonyms used to refer to polyurethanes, including polyurethane elastomers, polyurethane foams, polyurethane resins, polyurethane coatings, and polyurethane adhesives. Other terms used to describe this thermoset polymer include PU, PEU, PUR, and PIR. The different types of polyurethanes are often distinguished by their specific properties, such as rigid or flexible, open-cell or closed-cell, aromatic or aliphatic, and high or low density. Regardless of their name, polyurethanes play a vital role in manufacturing processes and final products across many industries.