Cov neeg siv uas tau siv cov tshuaj lom neeg siv roj hmab yuav paub tias cov khoom lag luam muaj tag nrho cov polyethylene ib zaug moulding tsis muaj nqaws, cuam tshuam tsis kam, laus tiv taus, lub teeb nyhav, tsis muaj xau, kua qaub thiab alkali tsis kam, lub neej ntev, thiab cov qauv huv. Cov txiaj ntsig, siv kev ua tau zoo dua li cov kab lis kev cai iav fiber ntau hauv cov thawv yas, cov thawv ntim khoom yas, cov kav hlau muaj roj thiab lwm cov thawv.
Peb paub tias cov tshuaj lom neeg siv roj hmab yas ua lub luag haujlwm tseem ceeb hauv peb lub hnub, tab sis vim yog cov khoom siv sib txawv siv hauv kev tsim cov tshuaj yas, cov khoom siv muaj txiaj ntsig ntawm cov tshuaj yas yas nrog cov khoom sib txawv kuj sib txawv. Cov khoom siv uas nquag siv rau kev lag luam tshuaj lom neeg yas yog polyethylene, polyvinyl chloride, thiab polypropylene. Txij li thaum cov yas thiab cov khoom siv ntxiv uas tau siv hauv kev tsim cov khoom siv hluav taws xob yas peb txheej no sib txawv, lawv yuav tsum tsis txhob siv rau cov khoom noj ntawm qhov xav tau. Tsis tas li ntawd, qhov zoo tshaj ntawm cov tshuaj tua kab yas yas uas peb siv tau muaj kev sib raug zoo nrog cov khoom siv raw khoom siv hauv kev pib tsim khoom.
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