Ama-screw caps e-Polypropylene (PP) ayisisetshenziswa sokuvala esithembekile nesiguquguqukayo esiklanyelwe ngokukhethekile izinhlelo zokusebenza ezihlukahlukene zokupakisha. Yenziwe ngezinto eziqinile ze-polypropylene, lawa makhava ahlinzeka ngophawu oluqinile nokumelana namakhemikhali, okuqinisekisa ubuqotho boketshezi lwakho noma amakhemikhali.