Raws li kev ntim khoom sab hauv, lub luag haujlwm tseem ceeb ntawm cov pob khoom blister yog kom ruaj ntseg thiab tiv thaiv cov khoom. Lawv cov kev tsim kho tau tuaj yeem phim cov duab ntawm cov khoom sib txawv, txo qis kev sib tsoo thiab kev sib tsoo thaum thauj. Cov khoom siv pob tshab tso cai rau cov neeg siv khoom ncaj qha saib cov ntsiab lus, txo qhov xav tau qhib lub thawv; rau hom zaub, logos lossis cov qauv tuaj yeem muab ntxiv los ntawm kev luam ntawv.
Tsis tas li ntawd, lub thickness ntawm 0.04mm ua kom lub zog thaum txo cov khoom siv, ua raws li cov qauv ntawm lub teeb yuag. Qee cov khoom lag luam ua tiav los tiv thaiv- zoo li qub lossis khawb- tiv thaiv kev ua haujlwm los ntawm kev kho qhov ceev, hloov mus rau qhov tshwj xeeb xav tau ntawm cov khoom siv hluav taws xob thiab lwm yam kev siv.
