Kev hloov hluav taws xob zoo: tooj liab muaj cov thermal conductivity zoo heev thiab tuaj yeem muab kev sib hloov pauv tau zoo.
Muaj zog corrosion kuj: tooj liab muaj cov tshuaj ruaj khov thiab yuav tsis tsim cov tshuaj phem txawm tias nyob rau hauv qhov kub thiab txias. Nws yog tsim rau lub sijhawm nrog qee qhov kev xav tau rau kev tiv thaiv corrosion.
Kev ua haujlwm nyuaj: Cov raj tooj liab yog qhov nyuaj rau kev ua, cov txheej txheem molding yog txwv, thiab tus nqi kuj yog siab heev.