Tsis pom tseeb, kev ruaj ntseg membrane yog hnub ci daim nyias nyias hloov khoom. Muab piv rau xyoo 1970, nrog kev tsim cov khoom yas yas, cov yeeb yaj kiab tswj hwm tsiaj txhu yog lub hnub ci foob (cov yeeb yaj kiab pov tseg, cov yeeb yaj kiab pov tseg), qhov kawg ntawm xyoo 1990 nyob rau theem ntawm kev nyab xeeb movie, rau nyias zaj duab xis cov khoom feem ntau yuav tsum muaj kev tswj ntawm lub teeb pom kev, tab sis kuj nyob hauv lub meej kev ntug. Lub siab tshaj plaws ntawm lub pov thawj series ntawm kev ruaj ntseg zaj duab xis tshawb xyuas pom txog 95% ntawm qhov kev xa xov, 99% ntawm UV thaiv thiab 86% ntawm cov hluav taws xob hluav taws xob thaiv.
Kev sib txuas, zoo li lub hnub qub uas zoo li hnub qub, cov yeeb yaj kiab kuj tseem siv nws cov dej-raws li lub siab tawv ua rau daim iav.