PP yog ib hom ntawm cov leeg tensile polypropylene plastics, uas belongs rau thermoplastic plastics. PP hnab yog tiag tiag cov hnab yas. Cov yam ntxwv ntawm PP hnab yog cov khoom tsis muaj tshuaj lom thiab tsis muaj mov. PP hnab ntim saum npoo yog qhov tseeb thiab pob tshab, dav siv hauv cov tshuaj pleev ib ce, khoom noj khoom haus, khoom ua si, ris tsho, ntawv sau, khoom siv hluav taws xob, khoom siv kho vajtse thiab lwm yam kev lag luam ntim. Cov hnab ntim hnab PP yog cov pob tshab hauv cov xim, zoo hauv qhov zoo, zoo hauv cov tawv, tsis muaj zog thiab tsis tuaj yeem khawb. Cov nqi khoom siv ntawm PP hnab yog pheej yig heev. Nws yog tus cwj pwm los ntawm kev sib txuas yooj yim, yaj poob poob ntawm cov nplaim hluav taws, daj thiab xiav, haus luam yeeb tsawg dua tom qab tua hluav taws, thiab sib txuas ntxiv mus ntxiv.
PE yog qhov luv ntawm polyethylene, uas yog thermoplastic resin npaj los ntawm polymerization ntawm ethylene. Polyethylene yog qhov tsis muaj ntxhiab, tsis muaj tshuaj lom, tsis muaj roj-zoo li, muaj qhov kub tsis tshua zoo tiv thaiv (kev ua haujlwm qis tshaj plaws tuaj yeem ncav cuag - 70 ~ 100 C), tshuaj lom neeg zoo, tiv taus feem ntau cov kua qaub-puag xeb (tsis tiv taus oxidizing acid), insoluble nyob rau hauv cov kev daws teeb meem ntawm chav sov, qhov nqus dej tsawg, ua tau zoo hluav taws xob rwb thaiv tsev; tab sis polyethylene rau ib puag ncig kev ntxhov siab (tshuaj lom neeg thiab hluav taws xob rwb thaiv tsev); Nws yog rhiab heev thiab muaj kev kub tsis zoo tiv thaiv kev laus. Cov khoom ntawm polyethylene sib txawv los ntawm ntau yam rau ntau yam, mas nyob ntawm nws cov qauv molecular thiab tuab. Cov khoom lag luam nrog cov khoom siv sib txawv (0.91-0.96g / cm3) tuaj yeem tau los ntawm cov qauv sib txawv. Lwm cov khoom PE tshiab cov yeeb yaj kiab-khaws cia kuj tseem tuaj yeem hu ua hnab PE. Them sai sai rau kev sib cuag ncaj qha nrog cov zaub mov tshiab-khaws cov zaj duab xis yuav tsum xaiv cov khoom siv PE, uas muaj kev nyab xeeb rau tib neeg lub cev.
