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Raws li ib qho tseem ceeb ntawm cov khoom siv PVC uas yooj ywm, cov yas ua kom muaj kev cuam tshuam loj rau kev ua haujlwm ntawm cov khoom siv PVC uas yooj ywm. Yog tias cov khoom siv PVC mos (PVC txias cia qhov rooj ntaub thaiv qhov rooj) yuav tsum tau siv rau qhov kub qis, cov yas ua kom muaj kev tiv thaiv kub zoo yuav tsum tau xaiv.
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DOP thiab DOTP yog cov yas ua kom siv tau dav dav los ua kom PVC mos dua, yoog tau yooj yim dua thiab yooj yim dua rau kev ua. Qhov txawv tseem ceeb yog lawv cov qauv molecular: DOP, feem ntau yog hais txog DEHP, yog ib qho orthophthalate, thaum DOTP, tseem hu ua DEHT, yog ib qho terephthalate thiab feem ntau raug xaiv los ua lwm txoj hauv kev uas tsis yog orthophthalate.