Yas ntim nruas yog siv rau cov khoom ntim phom sij. Lawv muaj cov yam ntxwv zoo, xws li tsis-tawg, tsis xeb thiab lub teeb hnyav, thiab lawv ua tau zoo heev ntawm cov roj ua haujlwm thiab muaj zog tiv thaiv corrosion. Nws feem ntau yog siv rau kev ntim khoom ntawm cov khoom txaus ntshai uas xav tau kev tiv thaiv tshav kub, noo noo tsis kam, siab tiv thaiv thiab corrosion kuj. Lub thawv yas ntim khoom ntim yog ua cov ntawv yas, yas, yas, Cov yas dhau, thiab lwm yam. Lub hnab ntim khoom ntim ntim ntim phom ntim phom ntim ntim ntim phom, lub teeb yuag, lub zog zoo, muaj kev cuam tshuam, kev tiv thaiv corrosion, folding, tsis muaj tshuaj lom thiab tsis qab, thiab kev thauj mus los yooj yim. Cov khoom lag luam yog tsim nyog rau txhua yam khoom noj muaj ntsev ua kua, khoom noj qab zib, tshuaj thiab cov khoom noj qab haus huv, haus cawv thiab cov khoom lag luam zoo nkauj. Cov yam ntxwv khoom: acid, alkali, siab kub, tsis muaj tshuaj lom, tsis muaj menyuam, tsis qab, thiab muaj cov tshuaj tiv thaiv zoo rau ncab thiab cuam tshuam.
Lub hnab yas ntim khoom lag luam feem ntau muaj cov haujlwm hauv qab no: 1. Lub hnab yas ntim khoom muaj lub luag haujlwm ntawm kev tiv thaiv cov ntsiab lus. Lub taub hau ntim ntim yas tuaj yeem tiv thaiv los ntawm ya raws, dej, hmoov av thiab xeb. Qhov cuam tshuam rau cov hmoov av sab nraud, dej thiab lwm cov kua ua kua; kev tiv thaiv ntawm kev ntim khoom Lub pob khoom cuam tshuam thiab corroded; nws tiv thaiv UV rays los ntawm nkag, hloov mus rau qhov hloov pauv ntawm qhov kub thiab txias, thiab tiv thaiv lub ntim khoom los ntawm lub hnub thiab ultraviolet rays. 2. Lub thawv ntim yas ntim muaj qhov ua haujlwm ntawm sab nraud quab yuam, thiab nws tuaj yeem hloov mus rau ntau hom kev thauj mus los thiab kev khaws cia ntawm cov chaw rau khoom kom tiv thaiv cov ntsiab lus ntawm kev puas tsuaj. 3. Lub thawv ntim yas ntim khoom pub rau cov khoom kom muaj cov zaub ua haujlwm. Lub thawv ntim yas ntim tuaj yeem tsim cov khoom lag luam muaj nuj nqi los ntawm cov tsos zoo nkauj, lub ci ci xim, cov nplaim du thiab pob tshab. Txaus siab cov neeg siv khoom thiab txhawb nqa cov neeg siv khoom lub siab xav yuav khoom.
