Blister Tshuab Daim Ntawv Thov Kev tsim cov ntawv ntim cov yas qis qis polyethylene yas coding

"No. 4" stands rau low-density polyethylene plastic (PE), uas yog cov khoom siv feem ntau siv rau kev tsim cov ntaub ntawv cling, yas zaj duab xis thiab lwm yam. Lub tshav kub tsis kam ntawm cov yas qhwv tsis muaj zog. Feem ntau, cov ntaub qhwv polyethylene uas tsim nyog yuav yaj thaum qhov kub siab tshaj 110 degree, tawm hauv qee qhov kev npaj yas uas tsis tuaj yeem decomposed los ntawm tib neeg lub cev. cua sov.