Mathematic Equations For The Calculation Of Glass Properties As Functions Of Chemical Composition. Ii. Refractive Index, Durability (In Italian)

A number of widely accepted mathematic equations from past literature are reviewed, amongst those established to calculate theoretical values of refractive index and the hydrolytic resistance of commercial soda-lime glasses starting from compositional data. After a comparison with laboratory data obtained at the Stazione Sperimentale del Vetro, approaches suggested by Huggins-Sun and Lakatos-Simmingskold were selected to evaluate the influence of different component oxides on the two examined properties. Starting from Hugging-Sun's model, an unpublished equation is duscussed here, which can be used for the prediction of vatriation of the refractive index np with a known density p and vice versa, at least for sheet and container-type glass.