I-Polypropylene (PP) i-screw caps sisixhobo sokutywina esithembekileyo nesiguquguqukayo esilungiselelwe ngokukodwa ukufakwa kwezicelo zokupakisha. Yenziwe ngezinto ezihlala ixesha elide zepolypropylene, ezi zigqubuthelo zibonelela ngesitywina esomeleleyo nesixhathisayo kwikhemikhali, siqinisekisa intembeko yolwelo okanye imichiza yakho.