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| Term | Description |
|---|---|
| Polyurethane | A polymer prepared by the reaction of an organic diisocyanate with compounds containing hydroxyl groups (polyols). Polyurethanes, or urethanes as they are sometimes called, may be thermosetting, thermoplastic, rigid or soft and flexible, cellular or solid; they can be aliphatic or aromatic. See "aliphatic polyurethane" and "aromatic polyurethane." |