Ob chav glazed
Insulating iav tau tsim los ntawm cov neeg Amelikas xyoo 1865. Nws yog ib hom tshiab ntawm cov khoom siv hauv tsev uas muaj cov rwb thaiv tsev zoo, suab rwb thaiv tsev, kev zoo nkauj thiab daim ntawv thov, thiab tuaj yeem txo qhov hnyav ntawm lub tsev.
Nws yog ua los ntawm ob lossis peb daim iav, siv lub zog siab thiab siab-airtight composite nplaum los khi cov iav rau ib qho txhuas alloy thav duab uas muaj cov desiccant los ua kom muaj suab nrov-insulating thiab kub-insulating iav.