Ntxiv cov lus qhia
Cov tshuaj ntxiv yog qhov tseem ceeb ntawm cov qib roj nplua nyeem niaj hnub no. Kev xaiv cov khoom tsim nyog ntxiv tuaj yeem txhim kho lawv cov khoom siv lub cev thiab tshuaj, qhia cov tshiab tshwj xeeb rau cov roj av, lossis txhim kho lawv cov khoom qub kom tau raws li cov kev xav tau ntau dua. Raws li qhov ua tau zoo thiab kev ua haujlwm ntawm cov roj nplua nyeem, ua tib zoo xaiv cov quav tshuaj ntxiv, ua tib zoo sib npaug, thiab kev ua haujlwm tsim nyog yog tus yuam sij rau kom ntseeg tau cov roj nplua nyeem zoo. Cov khoom siv feem ntau yog: viscosity index tsis raug, nchuav taw tes rau qhov tsis txaus siab, tshuaj tiv thaiv kab mob, tshuaj tua kab mob, kev sib txhuam, tus neeg sawv cev roj, huab siab hnyav ntxiv, tiv thaiv-ua npuas ncauj, hlau passivator, emulsifier, los tiv thaiv xeb, tiv thaiv xeb, tiv thaiv xeb, anti-oxidant thiab anti-xeb tus neeg sawv cev.