Polimero ottenuto per poliaddizione di polialcoli e diisocianati. I P. trovano impiego come materiali da stampaggio, adesivi, vernici, e come elastomeri e fibre sintetiche. I vari manufatti in P. hanno buone proprietà dielettriche, meccaniche, termiche; si possono ottenere blocchi e pannelli con porosità chiuse, usati per isolamento termoacustico.
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