Cov qhov rooj iav sawv cev ib yam ntawm qhov rooj vaj huam sib luag; Lawv cov yam ntxwv tseem ceeb yog raws li nram no:
Cov khoom siv thiab cov yam ntxwv: Lawv feem ntau yog tsim los ntawm 12 hli - iav tuab - feem ntau tempered iav - muab ob qho tib si durability thiab kev nyab xeeb. Lawv poob rau hauv cov khoom tsis zoo-cov tub ntxhais lossis cov pawg qhov rooj tsis zoo; lawv cov yam ntxwv yog txhais ncaj qha los ntawm cov khoom ntawm iav nws tus kheej.
Cov cwj pwm ua haujlwm: Cov qhov rooj ua nrog cov iav ntshiab muab cov pob tshab thiab tso cai rau lub teeb ntuj hla dhau, thaum cov iav frosted muaj cov nyhuv semi- translucent. Nyob ntawm hom iav, lawv kuj tuaj yeem muab cov haujlwm tshwj xeeb xws li ib qho - txoj kev pom, lub zog - thermal rwb thaiv tsev zoo, thiab suab tsis zoo.
Cov yam ntxwv ntawm cov neeg siv kev paub: Qhov saum npoo yog du thiab yooj yim los ntxuav, nrog rau kev tiv thaiv corrosion thiab cuam tshuam. Qee qhov kev nyab xeeb iav qhov rooj yog tsim los kom tsis txhob tawg mus rau hauv cov phom ya txaus ntshai, yog li txo qhov kev pheej hmoo ntawm kev raug mob.