Feem ntau ntawm cov tshuaj lom neeg cov tshuaj yog tsim los ntawm cov yas, feem ntau hu ua yas tshuaj lom neeg thiab cov kav tshuaj yas. Lawv yog tshuab-moulded siv cov qauv qauv. Lawv muaj ntau hom xim thiab cov tsos zoo nkauj. Lawv tiv taus cov kua qaub thiab alkali, xeb, thiab xau. Fading, tsis deforming thiab lwm yam ncav cuag lub ntim ntim, nws yog qhov kev xaiv zoo tshaj plaws rau kev thauj mus ntev ntawm cov khoom ntim tshuaj lom neeg. Txij li hnub yug, cov khoom lag luam yas tau puv peb lub neej txhua lub sijhawm. Thiab los ntawm cov hwj yas me me, cov hnab yas, cov mov yas rau cov thoob yas loj thiab lwm yam. Txawm hais tias cov khoom lag luam yas muag plump, zoo nkauj thiab pheej yig. Tab sis cov khoom yas kuj tseem muaj tib lub shattering phenomenon li iav ntaub ntawv.
Cov yas (cov qauv: cov roj hluavtaws, cov yas yas, cov xim ua kom lub zog, cov yeeb yuj) cov thawv yog feem ntau pom hauv peb lub neej, los ntawm kev ntim cov dej haus, cov khoom siv tshuaj, rau cov dej cawv. Cov khoom ntim yas ntim khoom siv yog siv dav hauv tshuaj, zas, tshuaj, tshuaj tua kab, metallurgy, ntiaj teb tsis tshua muaj, tshuab, khoom siv hluav taws xob, kev tiv thaiv ib puag ncig, textile, zaub mov thiab lwm yam lag luam. Cov thawv ntim yas tuaj yeem hloov cov hlau tsis xeb, titanium thiab lwm yam khoom lag luam hlau ntim hauv ntau ntau. Nws yog qhov zoo tshaj plaws corrosion-resistant cia thiab thauj khoom siv rau cov kua tshuaj, thiab nws yog pheej yig thiab zoo. Feem ntau peb them ntau dua rau qhov teeb meem plasticizer hauv cov thoob yas, thiab tsis quav ntsej txog kev laus thiab tawg ntawm cov thoob yas hauv lub caij ntuj no txias. Cov kev pab cuam lub neej ntawm cov yas thoob yog txawv ntawm cov hwj yas. Tom qab haus dej, cov hwj yas raug rov ua dua los yog coj mus pov tseg. Cov thoob yas tuaj yeem rov qab siv dua vim tias lawv muaj ntau qhov kev siv (fàn wéi), yog li qhov zoo ntawm cov thoob yas yuav tsum yog qhov tseem ceeb dua. Qhov no yog qhov tshwj xeeb tshaj yog nyob rau hauv kev saib pom tias cov thawv ntim roj hmab tiv thaiv kev laus thaum lub caij txias. Thaum cov thoob yas muaj hnub nyoog, lawv tau yooj yim tawg. Cov yas tawg yog cov tsis muaj nqi rau kev rov ua dua tshiab los yog lwm cov hom phiaj, thiab kev siv ntawm cov yas khib nyiab yuav poob qis (nqis los).
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