Polyurethane (AU, EU, PU)

Polyurethane is a polymer formed from a chain of organic units joined by urethane links. Polyurethanes are

produced by the addition reaction of a polyisocyanate with a polyalcohol (polyol) in the presence of a catalyst and other additives.

Polyurethane demonstrates excellent resistance to weathering and oxidation. They resist hydrocarbon fuels and mineral oils, however some grades degrade (hydrolyse) in hot water.

Polyurethane also offers some of the best resistance to abrasion, and are therefore often specified for use in dynamic seals.