Polyurethane (PUR / PU) is a polymer composed of organic units joined by urethane (carbamate) links.

Fully reacted polyurethane polymer is chemically inert. Carcinogenity is not known.

More health information is available
– USA: Polyurethane Manufacturers Association (PMA), Center for the Polyurethanes Industry (CPI)
– Europe: ISOPA (European Diisocyanate and Polyol Producers Association)

Examples for implants are meniscus and acetabulum.