Ua los ntawm cov pwm, nws cov ntaub ntawv tseem ceeb yog quartz xuab zeb thiab alkali thiab lwm yam khoom siv. Tom qab melting saum toj no 1200 ° C kub, nws yog tsim nyob rau hauv sib txawv duab los ntawm kub molding raws li cov pwm zoo. Tsis muaj tshuaj lom thiab tsw ntxhiab. Haum rau tshuaj pleev ib ce, khoom noj khoom haus, ...
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