VISCOSITY STUDIES OF SYSTEM CaO‐MgO‐Al ₂ O ₃ ‐SiO _2: II, CaO‐Al ₂ O ₃ ‐SiO ₂ *

Abstract

A bstract Viscosity data are presented covering those compositions in the CaO‐Al 2 O 3 ‐SiO 2 system which are liquid at 1500°C. The pattern of isokoms on the CaO‐Al 2 O 3 ‐SiO 2 face of the compositional tetrahedron which represents the CaO‐MgO‐Al 2 O 3 ‐SiO 2 system is a system of lines which roughly parallel the lines along which the lime content is constant. There are, however, considerable deviations from this parallelism in regions of very low and very high alumina content.