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Polytetrahydrofuran (PTMEG or PolyTHF) with the formula HO-[-CH2CH2CH2CH2O-]n-H is a white solid that melts into a clear, colorless liquid when heated to a temperature above room. It is an important intermediate in manufacturing spandex fibres, thermoplastic polyurethane elastomers and copolyether-esters elastomers.
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