nsalu imapangidwa ndi ulusi wopangidwa ndi polypropylene, wokhala ndi ubwino wa asidi ndi kukana kwa alkali, kukokoloka kwa nthaka, kukalamba, mphamvu yayikulu, kukula kokhazikika komanso kusefera kwabwino etc. kudzipatula kwathunthu mchipinda choyendera cha wodwalayo kuchipatala