Mathireyi a CPET, kapena mathireyi a Crystalline Polyethylene Terephthalate, ndi mtundu wa maphukusi a chakudya opangidwa kuchokera ku mtundu winawake wa zinthu zopangidwa ndi thermoplastic. CPET imadziwika kuti imapirira kutentha kwambiri komanso kotsika, zomwe zimapangitsa kuti ikhale chisankho chodziwika bwino pamitundu yosiyanasiyana ya maphukusi a chakudya.

Inde , mathireyi apulasitiki a CPET amatha kuphikidwa mu uvuni. Amatha kupirira kutentha kuyambira -40°C mpaka 220°C (-40°F mpaka 428°F), zomwe zimathandiza kuti azigwiritsidwa ntchito mu ma uvuni a microwave, ma uvuni wamba, komanso malo osungiramo zinthu ozizira.

Kusiyana kwakukulu pakati pa mathireyi a CPET ndi mathireyi a PP (Polypropylene) ndi kukana kutentha ndi zinthu zomwe zili mkati mwake. Mathireyi a CPET ndi otetezedwa kutentha kwambiri ndipo angagwiritsidwe ntchito mu uvuni wa microwave ndi wamba, pomwe mathireyi a PP nthawi zambiri amagwiritsidwa ntchito poika ma microwave kapena kusungiramo zinthu zozizira. CPET imapereka kulimba bwino komanso kukana kusweka, pomwe mathireyi a PP ndi osinthika kwambiri ndipo nthawi zina amakhala otsika mtengo.

Mathireyi a CPET amagwiritsidwa ntchito popangira zakudya zosiyanasiyana, kuphatikizapo chakudya chokonzeka, zinthu zophika buledi, zakudya zozizira, ndi zinthu zina zomwe zimawonongeka zomwe zimafunika kutenthedwanso kapena kuphikidwa mu uvuni kapena mu microwave.

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