Ntawm Jiuding, peb txaus siab rau peb cov khoom siv tes ua haujlwm zoo thiab qhov tshwj xeeb ntawm peb cov khoom.Ib qho ntawm peb cov kev tshwj xeeb yog tes nteg, txheej txheem uas cuam tshuam nrog cov ntaub qhwv thiab saturating nws nrog polyester lossis epoxy resin.Cov txheej txheem no ua rau kev tsim cov khoom tsis txaus ntseeg, muaj zog, thiab cov khoom siv hnyav.
