Dawb corundum thiab xim av corundum yog ob hom abrasive log siv hauv kev sib tsoo thiab polishing daim ntaub ntawv. Txawm hais tias lawv yuav tshwm sim zoo sib xws, muaj ntau qhov sib txawv tseem ceeb ntawm ob.
Dawb corundum, tseem hu ua dawb txhuas oxide, yog cov khoom siv ntshiab thiab tawv tawv heev. Nws muaj qhov siab hardness ntsuas ntawm 9 ntawm Mohs nplai, ua rau nws zoo tagnrho rau kev sib tsoo cov haujlwm. Dawb corundum kuj yog kub resistant thiab muaj peev xwm tiv taus siab kub yam tsis muaj melting los yog warping. Yog li ntawd, nws yog feem ntau siv rau hauv cov ntawv thov uas yuav tsum tau ua tiav zoo, xws li tsheb thiab aerospace kev lag luam.
Ntawm qhov tod tes, xim av corundum, tseem hu ua xim av aluminium oxide, yog ib qho nyuaj thiab denser abrasive khoom tshaj dawb corundum. Nws muaj qhov qis dua qhov ntsuas ntawm 8 ntawm Mohs nplai, tab sis tseem suav tias yog cov khoom siv ruaj khov thiab siv tau zoo. Brown corundum kuj muaj ntau yam ntau dua li dawb corundum, vim nws tuaj yeem siv rau ob qho tib si ntxhib thiab zoo sib tsoo daim ntaub ntawv.