High-cov yas yas zoo tuaj yeem siv tau 5-10 xyoo nyob rau hauv kev siv ib txwm siv, nyob ntawm cov khoom siv (xws li UV tsis kam thiab tshuaj lom neeg), kev siv ib puag ncig (UV siv, kub, thiab av noo), thiab kev siv zog (pom zoo load tsawg dua lossis sib npaug li 80% ntawm tus nqi nominal). Cov yam tseem ceeb cuam tshuam muaj xws li:
1. Cov khoom siv zoo: Siab-molecular- cov khoom hnyav xws li HDPE / PP muaj lub neej ntev dua li cov khoom siv rov ua dua tshiab;
2. Kev cuam tshuam ib puag ncig: Kev tshav ntuj ncaj qha tuaj yeem ua rau lub neej luv ntawm 30%-50%;
3. Mechanical stressing: Overloading yuav ua rau kom muaj kev qaug zog.
Txhawm rau kom ntev lub neej, nws raug nquahu kom xaiv cov khoom tsim los ntawm cov ntaub ntawv nkauj xwb (qhov ntom ntom 0.94-0.96 g / cm³), tsis txhob cuam tshuam rau ib puag ncig ntev dua 60 degree, thiab ntxuav tsis tu ncua (nrog cov tshuaj ntxuav tes tsis tu ncua).
