Liquidus temperatures (T1) were measured for the following float glass-type composition region (in mass%): 72.7 to 74.0 SiO2, 13.1 to 14.2 Na2O, 7.95 to 8.95 CaO, 2.97 to 3.97 MgO, 0.10 to 0.45 Al2O3, and 0.03 to 0.10 K2O. Glasses also contained minor fractions of Fe2O3 (0.71) & TiO2 (0.01). Fractions of silica, wollastonite, & devitrite were determined in glasses quenched from 900C. Partial specific values for Tl were evaluated for silica & wollastonite phase-fields. The measured Tl values were compared with values estimated using various models available in the literature. The differences between predicted & measured Tl for the float glass composition region can be attributed to several causes, the most prominent being the neglecting of differences in the slopes of liquidus surfaces within different primary phase-fields.
