PMID 28776036. ^ Nearly all polyurethanes are thermosets, having said that some thermoplastics are manufactured, for instance spandex ^ PP&A stand for polyester, polyamide and acrylate polymers; all of which can be accustomed to make synthetic fibers. Care ought to be taken not to confuse it with polyphthalamide (PPA) ^ https://petert011wrk4.wikiinside.com/user