Feem ntau, lubricants tau muab faib ua cov roj ntsha tsis muaj roj thiab cov roj ntsha organic raws li lawv cov tshuaj muaj pes tsawg leeg thiab cov qauv.
Inorganic lubricants yog cov sib xyaw ua ke ntawm talcum hmoov, mica hmoov, av nplaum, av nplaum dawb, thiab lwm yam, uas yog siv los ua cov neeg ua haujlwm tso tawm rau cov yeeb yaj kiab thiab cov khoom ua tiav hauv cov khoom siv roj hmab.
Hauv kev tsim khoom tiag tiag, cov roj nplua nyeem organic tau siv dav, uas tuaj yeem muab faib ua fatty acids, fatty acid esters, fatty acid amides, fatty alcohols, hlau soaps, hydrocarbon compounds, alcohols thiab organosiloxanes raws li lawv cov qauv tshuaj.