Cov khoom siv ntawm cov hnab ntim yas: 1. Polyethylene Nws yog polyethylene, uas yog siv dav hauv cov hnab yas ntim khoom. Nws yog lub teeb thiab pob tshab. Nws muaj qhov zoo ntawm qhov zoo tshaj noo noo tsis kam, oxygen tsis kam, acid tsis kam, alkali tsis kam, kub sealing, thiab lwm yam, thiab nws tsis yog ...
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