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technologies (also known as speciality plastics, foams (urethane, flexible, rigid) pet & preform processing technology handbook) polyester or polyethylene terephthalate (pet) is an unreinforced, semi-crystalline thermo-plastic polyester derived from polyethylene terephthalate. its excellent wear resistance
polyurethanes can be produced in four different forms including elastomers, coatings, flexible foams, and cross-linked foams. elastomers are materials that can be stretched but will eventually return to their original shape. they are useful in applications that require strength, flexibility, abrasion resistance...
https://niir.org/books/book/handbook-on-pet-film-sheets-urethane-foams-flexible-foams-rigid-foams-speciality-plastics-stretch-blow-moulding-injection-blow-moulding-injection-co-injection-preform-technologies/isbn-9788178331775/zb,,18bbf,a,0,0,a/index.html