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Slag viscosity is an essential parameter for the metal manufacturing since it affects the appropriate refining process and separation of the slag and the liquid metal, and the rate of tapping from the furnace. The slag viscosity is related to the structure of the oxide melts and is very sensitive to the changes of temperature and composition. Viscosities of liquid slag systems have been extensively studied and many models have been developed. The early models are based on the well-known Arrhenius equation to describe the temperature dependence of silicate viscosities; however, the dependency on the composition is fully empirical. The Urbain approach1) is one of the most widely used slag viscosity models and it considers that the slag constituents are classified into three categories: glass former (SiO2), modifiers (CaO), and amphoterics (Al2O3). In another viscosity model, Riboud et al.2) classified the oxide components of the slag into five categories, depending on their ability to break or form polymeric chains in the molten slag. Structural based models have been developed recently considering that the silica network structure breaks down with the addition of basic oxides giving a more depolymerized structure. These models consider that the silicate melts contain three types of oxygen: (1) bridging oxygen Use of a Structural Model to Calculate the Viscosity of Liquid Silicate Systems