Mivuto yokhala ndi khoma limodzi: PVC ndiye chinthu chachikulu chopangira, chomwe chimapangidwa ndi kuwulutsa kuphulika kwa extrusion.Ndi mankhwala opangidwa mu 1970s.Pakatikati ndi kunja kwa chitoliro chokhala ndi khoma limodzi ndi corrugated. Popeza dzenje la chitoliro cha pulasitiki chokhala ndi zitoliro lili mumtsinje ndipo ndi lalitali, limagonjetsa bwino zovuta za mankhwala opangidwa ndi mipanda yathyathyathya omwe ndi osavuta kutsekedwa komanso zimakhudza ngalande zotsatira.Kapangidwe kake ndi koyenera, kotero kuti chitolirocho chimakhala chokwanira kukakamiza komanso kukana.