Kev siv yam ntxwv thiab hom iav fwj

Cov iav fwj yog cov ntim ntim loj hauv cov khoom noj, tshuaj, thiab tshuaj lom neeg kev lag luam. Lawv muaj kev ruaj ntseg tshuaj zoo; Yooj yim rau seal, zoo huab cua nruj, pob tshab, thiab qhov xwm txheej ntawm cov khoom tuaj yeem pom los ntawm sab nraud; Kev ua haujlwm ruaj khov zoo; Smooth thiab huv si saum npoo, yooj yim rau kev tua kab mob thiab ua kom tsis muaj menyuam; Zoo nkauj tsos, nplua nuj thiab muaj yeeb yuj kho kom zoo nkauj; Nws muaj qee yam kev siv lub zog thiab tuaj yeem tiv taus lub siab hauv lub raj mis thiab sab nraud quab yuam thaum thauj; Kev faib tawm dav ntawm cov khoom siv raw, tus nqi qis, thiab lwm yam zoo. Nws qhov tsis zoo yog qhov loj (loj loj rau qhov muaj peev xwm piv), siab brittleness, thiab fragility. Txawm li cas los xij, cov kev tsis txaus no tau txhim kho tau zoo los ntawm kev siv cov thev naus laus zis tshiab xws li cov phab ntsa nyias nyias thiab lub cev chemical tempering. Yog li ntawd, kev tsim cov iav fwj tuaj yeem nce xyoo los ntawm xyoo hauv kev sib tw hnyav nrog cov yas, tins, thiab cov kaus poom.