1. Acid kuj, corrosion kuj, zoo rwb thaiv tsev, tsis yooj yim rau kev laus, lub teeb yuag, nyab xeeb, tsis muaj tshuaj lom thiab muaj zog durability.
2. Cov khoom lag luam muaj cov yam ntxwv ntawm kev xa khoom sai, zoo rwb thaiv tsev, tsis muaj qhov ntsuas tus kheej, yooj yim siv thiab lwm yam.
3. Cov tshuaj tiv thaiv tshav ntuj, tsis muaj dej, noo noo-pov thawj thiab plua plav. 4. Durable. Yog li ntawd, thaum siv sab, qhov muaj peev xwm ntawm kev puas tsuaj thaum lub sij hawm tsim kho thiab kev puas tsuaj rau tus kheej tom qab siv yog me me, uas ua lub luag haujlwm tseem ceeb hauv kev ua kom muaj kev ncaj ncees thiab kev ua haujlwm ntawm txhua lub hnab ntim thiab ua kom muaj kev nyab xeeb thiab ruaj khov ntawm koj qhov project.
