Tam sim no muaj ntau cov hlau hlau thaiv tau ntawm txhuas. Peb txhua tus paub tias txhuas profiles, uas yog txhuas rods, yog rhuab thiab extruded kom tau txais ntau seem ntawm txhuas.
Kev tsim cov txheej txheem ntawm txhuas profiles tsuas yog muaj peb cov txheej txheem: casting, extrusion thiab xim. Ib txoj kev nyuab heev.
Thaum lub nplaim ntawm cov txheej txhuas hniav yog eroded thiab polluted, nws yuav tsum tau muab ntxuav hauv lub sijhawm, thiab cov nplai yuav tsum tau tsuas nrog cawv los yog cov pos hniav ua ntej nrog cov ntaub mos muag. Ib txheej ntawm acrylic resin varnish yuav ua tau evenly sprayed. 
