Thermodynamic calculation of liquidus temperatures in multicomponent systems has advanced far enough to justify a comparison with results calculated using equations based on regression analysis on large sets of experimental determinations. The first attempts to find empirical models were don by the mid 1970s. These models were, however, restricted to rather narrow composition ranges or to given primary phase fields. A model covering a fairly large set of compositions was developed within a joint venture between Philips, Saint-Gobain and the universities of Sheffield and Abo Akademi. Their model was based on fifty glasses in the system Na20-K20-Mg0-Ca0-Sr0-Ba0-Pb0-Al203-B203-Si02. This paper extends the set of data used and compares liquidus temperature estimates obtained by the models with temperatures obtained by thermodynamic calculation.
