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The viscosity of SiO 2-Al 2 O 3-CaO-MgO system and its subsystems are of fundamental importance for control and optimization of metallurgical, material, energy and geological phenomena. In this work, an accurate and simple viscosity model suitable for use in numerical simulations was established for SiO 2-Al 2 O 3-CaO-MgO system and its subsystems, based on the physically meaningful MYEGA equation. The model was calibrated by 4403 viscosity data measured in non-graphite crucibles. It was found current model calculates the viscosity with a remarkable overall accuracy of 15.8%. For each of the subsystems, current model also results in very good accuracy lower than 20%. The model could calculate the viscosity very reliably over the entire composition, temperature and viscosity value ranges studied in the work, even for viscosity value as low as 10 − 2 Pa•s. The composition dependences of viscosity for binary, ternary and quaternary systems were derived using established model. The effects of each component on viscosity were interpreted according to the concept of network "former" and "modifier" and the charge compensation effect of Ca 2 + on the tetrahedral-coordinated structure of Al 3 +. KEY WORDS: viscosity; SiO 2-Al 2 O 3-CaO-MgO systems; graphite crucible; network former; network modifier; numerical simulation.

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