Any of various thermoplastic polymers that contain urethane. Polyurethanes can vary widely in their flexibility and rigidity — eraser-soft to bowling-ball-hard. They are typically used in resins, chemical-resistant coatings, elastomers, adhesives, fibers, and foams for padding and insulation. Polyurethanes can be obtained in cast sheets, bars, rods, and tubes, as well as in liquid forms in both water and oil-based formulas. (Artlex.com)

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