A CPET thireyi , kapena Crystalline Polyethylene Terephthalate thireyi , ndi mtundu wa ma CD opangidwa kuchokera ku mtundu winawake wa thermoplastic. CPET imadziwika kuti imapirira kutentha kwambiri komanso kotsika, zomwe zimapangitsa kuti ikhale yodziwika bwino pa ma CD osiyanasiyana ogwiritsira ntchito.

Inde , CPET pulasitiki thireyi imatha kuphikidwa mu uvuni. Amatha kupirira kutentha kuyambira -40°C mpaka 220°C (-40°F mpaka 428°F), zomwe zimathandiza kuti zigwiritsidwe ntchito mu uvuni wa microwave, mu uvuni wamba, komanso mufiriji.

A Kusiyana kwakukulu pakati pa CPET thireyi ndi PP (Polypropylene) thireyi ndi kukana kutentha ndi zinthu zomwe zili mkati mwake. CPET thireyi ndi zolimba kutentha kwambiri ndipo zitha kugwiritsidwa ntchito mu uvuni wa microwave ndi wamba, pomwe PP thireyi nthawi zambiri imagwiritsidwa ntchito popangira ma microwave kapena kusungiramo zinthu zozizira. CPET imapereka kulimba bwino komanso kukana kusweka, pomwe PP thireyi ndi yosinthasintha ndipo nthawi zina imakhala yotsika mtengo.

Ma CPET thireyi amagwiritsidwa ntchito popangira zakudya zosiyanasiyana, kuphatikizapo chakudya chokonzedwa kale, zinthu zophika buledi, zakudya zozizira, ndi zinthu zina zomwe zimawonongeka zomwe zimafunika kutenthedwanso kapena kuphikidwa mu uvuni kapena mu microwave.

A CPET ndi PET onse ndi mitundu ya ma polyester, koma ali ndi makhalidwe osiyanasiyana chifukwa cha kapangidwe ka mamolekyu awo. CPET ndi mtundu wa kristalo wa PET , womwe umapangitsa kuti ikhale yolimba komanso yolimba kwambiri kutentha kwambiri komanso kotsika. PET nthawi zambiri imagwiritsidwa ntchito pamabotolo a zakumwa, zidebe za chakudya, ndi zina zomwe zimayikidwa m'mabokosi zomwe sizifuna kulekerera kutentha kofanana. PET ndi yowonekera bwino, pomwe CPET nthawi zambiri imakhala yosawonekera bwino kapena yowonekera pang'ono.