PMID 28776036. ^ Many polyurethanes are thermosets, however some thermoplastics also are made, As an illustration spandex ^ PP&A stand for polyester, polyamide and acrylate polymers; all of which are accustomed to make synthetic fibers. Care really should be taken never to confuse it with polyphthalamide (PPA) ^The Screw-In Series of Gore venting