Izinto eziphambili zeglasi ezinemibala zihlanjululwe isanti yequartz kunye ne-potassium feldspar, i-albite, i-lead oxide (inxalenye esisiseko yeglasi), i-saltpeter (i-nitrate ye-potassium: i-KNO3; ukupholisa), isinyithi se-alkali, isinyithi se-alkaline yomhlaba (i-magnesium chloride: i-MgCl, i-melting aid. , ukwandisa ukuqina), i-aluminiyam oxid...
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