Embonini yezemithi, isidingo sezixazululo zokupakisha ezihlinzeka ngamazinga aphezulu okuvikela ekungeneni komswakama kanye ne-oxygen sibalulekile. Ukuqinisekisa ubuqotho kanye nokusebenza kahle kwemithi ebucayi kudinga izinto ezingaletha izakhiwo zokuvimbela ezingaguquki. Ama-resin e-EVOH (Ethylene Vinyl Alcohol) avele njengabadlali ababalulekile kulesi sigaba ngenxa yamandla awo akhethekile okuvikela imikhiqizo ezicini zemvelo eziwohlokayo.