Cov vaj huam sib luag hlau feem ntau yog tsim los ntawm ob txheej ntawm cov hlau, thiab cov txheej nruab nrab yog tsim los ntawm cov nplaim hluav taws thiab cov khoom tsis muaj tshuaj lom, uas tuaj yeem ua tiav cov txiaj ntsig ntawm kev noj tsawg, ntsuab thiab kev tiv thaiv ib puag ncig yam tsis muaj kev txo qis kev siv (huab cua tsis kam. , mechanical zog, flatness, thiab lwm yam). Cov vaj huam sib luag hlau yog lub npe hu ua huab tais ntawm cov ntaub thaiv phab ntsa thiab cov phab ntsa sab hauv tiav hauv kev lag luam, thiab tuaj yeem muab faib ua ntau hom sib txawv raws li cov substrates sib txawv, cov ntaub ntawv tseem ceeb thiab cov txheej txheem. Nrog rau kev txhim kho thiab kev nce qib ntawm cov txheej txheem, cov txiaj ntsig thiab kev ua haujlwm nws tuaj yeem nthuav tawm kuj nce ntxiv.
