Tsab ntawv xov xwm no tshawb txog qhov sib txawv ntawm PET (polyethylene terephthalate) thiab PVC (polyvinyl chloride) cov ntawv hais txog kev ua haujlwm, kev siv, thiab kev cuam tshuam ib puag ncig. Los ntawm kev sib piv lawv cov khoom muaj pes tsawg leeg, cov khoom siv lub cev, thiab kev siv ntau yam kev lag luam, yuav tau txais kev nkag siab zoo ntawm ob qho khoom siv yas no.
