Txawm hais tias ob qho tib si cov ntaub ntawv yog polyethylene, lawv muaj cov yam ntxwv sib txawv.
LDPEis softer, ntau yoog raws thiab yaj ntawm qhov kub qis dua HDPE.
LDPEis siv rau hauv lub hnab sandwich thiab lwm yam kev ntim khoom.
HDPEis tawv tawv, muaj tshuaj ntau dua kev tiv thaiv thiab tuaj yeem tiv taus kub dua.
