A new approach is developed for modeling the temperatureand composition dependence of glass viscosity in the system Na2O-CaO-MgO-Al2O3-SiO2.The temperature dependence is described using the equation log(log h) = A + B log T.The dependence of the coefficients A and B on chemical composition of the glassis expressed using reduced full-cubic mixture polynomials. The new approach ismuch simpler to develop and use than the previous approach, and it has thepotential to yield better property-composition models. The new approach yieldsan improved model for the dependence of viscosity on composition in the Na2O-CaO-MgO-Al2O3-SiO2glass system studied.
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