Rov qab siv cov khoom siv tshuaj yas ntawm cov yas yog sim thiab siv los ntawm ntau lub lag luam. Vim tias cov khoom siv rov qab ua dua tshiab hauv cov yas yas tsis tuaj yeem tsuas yog txo cov kuab paug ib puag ncig xwb, tab sis kuj txuag tau cov khoom nyoos. Nws yog cov khoom siv pov tseg yas, thiab nws yog qhov yooj yim rau txheej txheem thiab daim ntawv, yog li nws tau dav siv. Vim tias lub thoob roj hmab yas nws tus kheej puas ntsoog thiab tsis yooj yim kho, kev siv cov yas ntim tshuaj lom neeg pov tseg tsis txhob pov tseg cov thoob khib nyiab yas;
Polyethylene yog cov tshuaj tiv thaiv uas muaj txheej txheem uas feem ntau siv hauv kev tsim cov tshuaj plastics. Nws muaj cov khoom zoo rau cov tshuaj feem ntau thiab cov khoom siv hauv tsev. Qee yam tshuaj lom neeg tuaj yeem ua rau qee yam cuam tshuam los kho, xws li corrosive oxidants, xylene thiab carbon tetrachloride. Cov polymers no tsis muaj hygroscopic effect thiab kuj muaj dej zoo vapor resistance zog, uas tuaj yeem siv rau ntim.
