1. Cov ntaub ntawv iav muaj cov khoom thaiv zoo, uas tuaj yeem tiv thaiv kev cuam tshuam ntawm cov pa oxygen thiab lwm yam gases rau sab hauv, thaum tseem tiv thaiv cov khoom tsis zoo ntawm sab hauv los ntawm evaporating rau hauv huab cua;
2. Cov fwj iav tuaj yeem rov siv tau ntau zaus, uas tuaj yeem txo cov nqi ntim khoom;
3. Cov iav tuaj yeem hloov xim thiab pob tshab;
4. Cov iav fwj muaj kev nyab xeeb thiab huv si, muaj kev tiv thaiv corrosion zoo thiab acid tsis kam, thiab tsim nyog rau ntim cov kua qaub (xws li cov kua txiv hmab txiv ntoo, thiab lwm yam);
5. Tsis tas li ntawd, vim qhov tsim nyog ntawm cov iav fwj rau kev tsim cov khoom siv tsis siv neeg puv cov kab ntau lawm, kev txhim kho tsis siv neeg filling tshuab thiab khoom siv rau iav fwj hauv Suav teb kuj tseem paub tab. Kev siv cov iav fwj rau ntim cov txiv hmab txiv ntoo, zaub, thiab dej haus muaj qee yam zoo hauv Suav teb.
