1. PE yas: Polyethylene yas muaj cov yam ntxwv ntawm cov kua qaub thiab alkali tsis kam, thiab tsis yooj yim tawg, ua rau nws tsim nyog rau kev siv sab nraum zoov. Txawm li cas los xij, cov thawv uas ua los ntawm PE yas tsis tiv taus qhov kub thiab txias thiab tsis haum rau khaws cov dej kub rau lub sijhawm ntev.
2. PP yas: Polypropylene yas feem ntau yog siv los ua cov khoom xws li lub khob ntim ntim thiab cov hnab ntim sab hauv. PP yas yog tshav kub-resistant thiab haum rau khaws cia kub thiab txias dej qab zib, tab sis nws yog ib tug kuj tsis yooj yim sua thiab tsis haum rau hnyav compression.
Tritan: hom yas tshiab uas tsis muaj tshuaj lom, noj qab nyob zoo, tiv taus qhov kub thiab txias, cuam tshuam, hnav, tsis muaj ntxhiab, thiab yooj yim los ntxuav. Tritan yas kuj yog cov khoom siv rov ua dua tshiab nrog qhov tseem ceeb ntawm ib puag ncig.