Cov xim hlau oxide, cov xim tsis muaj organic uas paub zoo, muaj ntau yam kev siv thoob plaws ntau yam lag luam. Hauv kev tsim kho, lawv ua lub luag haujlwm tseem ceeb hauv kev pleev xim rau cov pob zeb, cib, thiab asphalt. Txawm hais tias nws yog cov xim liab sov ntawm cov cib dai kom zoo nkauj lossis cov xim av ntawm txoj kev taug kev, cov xim no ua rau pom kev zoo dua thaum tseem tiv thaiv kev puas tsuaj.

Cov lag luam yas kuj tau txais txiaj ntsig los ntawm cov xim no, siv lawv los pleev xim rau txhua yam khoom siv hauv tsev mus rau cov khoom siv hauv kev lag luam, ua kom cov xim ruaj khov txawm tias nyob hauv qhov xwm txheej nyuaj. Tsis tas li ntawd, cov kua mem, cov tshuaj pleev ib ce, thiab cov khoom siv kos duab vam khom cov xim hlau oxide. Lawv tsis muaj tshuaj lom ua rau lawv haum rau cov tshuaj pleev ib ce, thaum nyob hauv kev kos duab, lawv muab cov kws kos duab nrog cov xim ruaj khov, ci ntsa iab rau cov duab kos thiab cov duab kos.