Khoom siv: Cov khoom siv ntawm cov dej tsis muaj dej thiab ua pa yuav tsum muaj cov dej tsis zoo, plua plav, tiv thaiv corrosion thiab lwm yam khoom kom ntseeg tau tias nws siv tau ntev.
Loj: Qhov tsim nyog loj ntawm cov dej tsis muaj dej thiab ua pa yuav tsum raug xaiv raws li cov lus qhia tshwj xeeb thiab cov tseev kom muaj ntawm cov kua thauj cov thoob kom ntseeg tau tias nws tuaj yeem nruj nreem ntsia ntawm lub qhov ncauj.
Structure: Cov qauv ntawm cov dej tsis muaj dej thiab nqus tau pa yuav tsum yooj yim thiab yooj yim rau nruab thiab tshem tawm. Nyob rau tib lub sijhawm, nws cov qauv kev ua pa sab hauv yuav tsum tsim nyog los xyuas kom meej tias huab cua tuaj yeem ncig tau dawb.
Kev Nyab Xeeb: Thaum xaiv thiab siv cov ntsaws ruaj ruaj thiab ua tsis taus pa, kev nyab xeeb yuav tsum raug txiav txim siab. Cov khoom tsim nyog nrog cov ntawv pov thawj tsim nyog yuav tsum tau xaiv thiab teeb tsa thiab siv kom raug raws li cov lus qhia.