Relating the temperature dependence of viscosity to the chemical composition of container glass

A new approach is developed for modeling the temperature and composition dependence of glass viscosity in the system Na 2 O-CaO-MgO-Al 2 O 3 -SiO 2 . The temperature dependence is described using the equation: log(log(η))=A+Blog(T). The dependence of the coefficients A and B on chemical composition of the glass is expressed using reduced full-cubic mixture polynomials. The new approach is much simpler to develop and use than the previous approach and it has the potential to yield better property-composition models. The new approach yields an improved model for the dependence of viscosity on composition in the Na 2 O-CaO-MgO-Al 2 O 3 -SiO 2 glass system studied.