PMID 28776036. ^ The majority of polyurethanes are thermosets, nevertheless some thermoplastics may also be manufactured, As an illustration spandex ^ PP&A stand for polyester, polyamide and acrylate polymers; all of which might be accustomed to make artificial fibers. Treatment should be taken never to confuse it with polyphthalamide (PPA) https://protective-vents02478.theisblog.com/36755656/plastic-protective-vents-can-be-fun-for-anyone