Cov khoom siv ntawm cov phom ntim tshuaj yog qhov siab-polyethylene, tseem hu ua polyethylene qis-siab, uas yog, HDPE. Cov khoom siv zoo li no tsis zoo nrog cov phom yas phom. Nws tuaj yeem raug ironed nrog hlau ntawv thiab hlawv nrog cov khoom qub. Nws kuj tseem siv tau rau kev ua haujlwm siab polymerization. Ethylene [LDPE] lossis EVA yas yog kub, thiab cov khoom siv no yog softer thiab muaj cov tawv zoo dua. Cov khoom zoo li no tsis muaj kua nplaum los lo rau tam sim no. Nws tsis muaj nyob thoob plaws lub ntiaj teb. Yog tias nws yuav tsum tau ua kom sib xyaw, nws yuav tsum yog txheej kho los ua cov nplaum.
HDPE yog ib hom qib high-crystallinity, tsis-polar thermoplastic cob. Tus thawj HDPE muaj qhov ntsej muag me me thiab cov duab pob tshab hauv daim ntu. PE muaj kev tiv taus zoo rau cov tshuaj lom neeg feem ntau hauv tsev thiab kev lag luam. Qee yam tshuaj muaj peev xwm ua rau cov tshuaj lom neeg xeb, xws li cov tshuaj tiv thaiv corrosive (concentrated nitric acid), cov tshuaj muaj ntxhiab hydrocarbons (xylene) thiab halogenated hydrocarbons (carbon tetrachloride).
Cov kua polymer tsis-hygroscopic thiab muaj dej zoo vapor tsis kam thiab tuaj yeem siv rau kev ntim khoom. HDPE muaj cov hluav taws xob muaj hluav taws xob zoo, tshwj xeeb tshaj yog lub zog dielectric, ua rau nws haum rau xaim thiab xaim. Nws muaj qhov nruab nrab zoo rau qib siab molecular phaus qib. Qhov cuam tshuam tsis sib xws yog li ntawm qhov ntsuas kub thiab txawm tias nyob rau qhov kub tsawg ntawm -40F. Tshuaj yas nruas siv hollow-qib qis-siab polyethylene. Muaj ntau qib ntawm cov khoom siv raw li ntawd. Kev siv cov keeb kwm sib txawv thiab cov keeb kwm sib txawv yog txawv, thiab qhov tsis zoo yog txawv. Lub Hoobkas feem ntau xaiv cov qib tsim nyog raws li cov khoom xav tau.
