Cov cuab yeej no tshawb xyuas ntau thiab txheeb xyuas qhov tsis xws luag sab hauv thiab sab nraud xws li, cov xov hlau tawg, puas, corrosion, qaug zog thiab lwm yam tsis xws luag.Nws tshawb fawb soj ntsuam qhov seem lifespan, xaim hlua kev ncaj ncees thiab txiav txim siab kev pab cuam lub neej ntawm cov hlua khi hlua khi.