Raws li cov khoom siv cable ntawm polyvinyl chloride thiab polyethylene, yuav tsum xav txog cov khoom hluav taws xob tom qab tha xim. Hauv particular, polyvinyl chloride vim nws tus kheej cov rwb thaiv kom txhob muaj polyethylene, ces qhov feem ntawm cov pigment yog ntau dua. Nws yog qhia hais tias xaiv cov xim uas tsis muaj pigments rau PVC zoo dua li cov organic pigments (tshwj tsis yog rau cov cua sov dub thiab anatase Titania).
Mobility
Mobility tshwm sim hauv cov yas yas hauv PVC, thiab thaum siv cov tshuaj los yog cov organic pigments. Lub npe hu ua migration yog nyob rau hauv cov kuab tshuaj uas nyob ib puag ncig ntawm ib feem ntawm cov hmoov tshauv los yog organic pigments, los ntawm cov yas coiscav rau cov nplais ntawm PVC cov khoom, cov yaj cov xim (xim) cov khoom siv kuj tuaj yeem coj mus rau ntawm Qhov khoom, yog li ntawd ntawm lub ntsiab ntawm cov xim, hnyav infiltration los yog Frost.
Lwm qhov teeb meem yog scaling. Hais rau tus neeg sawv cev ntawm cov xim, vim tias qhov xim tsis zoo los yog tsis haum nrog lub substrate los ntawm lub cev, qhov tso rau hauv cov khoom ua ntu (xws li extruder chim ntsa phab ntsa, qhov ncauj pwm qhov hauv phab ntsa).