Abstract
The viscosities and melting points of SiO2-rich oxide melts depend on their composition. This work presents viscosities, calculated in FactSage, for various binary oxide melts
consisting of SiO2 and various levels of a secondary oxide from: [Fe2O3, Al2O3, CaO, K2O]. Also included are the calculated viscosities of molten industrial quartzes based on
compositions published in literature. The viscosities have been calculated between the liquidus-temperature and up to 2200 °C.