Lub softening kub ntawm ib txwm iav ntawm qhov kub thiab txias yog li ntawm 700 ℃, thaum lub softening point ntawm ib daim ntawv tshiab arson iav yog ntau tshaj 1200 ℃, uas yuav luag piv nrog high-qib quartz iav, tab sis nws yog ntau pheej yig dua quartz. iav raws li tus nqi.

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