Thaum tshav kub kub hloov zaj duab xis yog cov khoom siv hluav taws xob hloov hluav taws xob los hloov cov qauv los ntawm cov khoom thauj mus rau saum npoo ntawm cov khoom siv. Nws yog dav siv rau kev kho kom zoo nkauj ntawm cov ntaub ntawv xws li hlau thiab yas. Piv rau kev tshuaj ntsuam luam ntawv lossis UV luam ntawv, cov yeeb yaj kiab hloov hluav taws xob tsis tas yuav tsum tau ua phaj, ua kom haum rau me me -batch ntau lawm. Nws cov xim txheej tuab tsuas yog 0.01-0.03 hli, uas yuav luag tsis muaj kev cuam tshuam rau qhov zoo nkauj ntawm cov khoom; thiab khawb tsis kam ntawm cov qauv pauv yog ntau dua 3 npaug ntau dua.
Ntawm cov khoom siv hlau, qhov sib txuas ntawm cov cua sov tuaj yeem ncav cuag qib 5B (100-} tus qauv xeem), deb tshaj li 3B qib ntawm cov tshuaj tsuag zoo tib yam. Rau cov xwm txheej uas yuav tsum tau hloov pauv ntau zaus (xws li khoom plig tshaj tawm), lub tev -thiab-hloov cov yeeb yaj kiab ntawm cov yeeb yaj kiab hloov hluav taws xob kuj tseem ua kom yooj yim dua.
