Kwishishini lamachiza, imfuno yezisombululo zokupakisha ezibonelela ngamanqanaba aphezulu okukhusela kumswakama kunye nokungena kwe-oxygen kubalulekile. Ukuqinisekisa imfezeko kunye nokusebenza ngempumelelo kwamachiza abuthathaka kufuna imathiriyeli enokunikezela ngeempawu zomqobo ezingagungqiyo. I-EVOH (i-Ethylene Vinyl Alcohol) ii-resin ziye zavela njengabadlali abaphambili kule ndawo ngenxa yesakhono sabo esikhethekileyo sokukhusela iimveliso ezivela kwizinto eziphazamisayo zokusingqongileyo.