Fig. 11: Triangular representation of the stability of glass composition.

R2O represent the content of network stabilisers (monovalent oxides), RO the content of network modifiers (divalent oxides), and SiO2 the content of silica.

R2O represent the content of network stabilisers (monovalent oxides), RO the content of network modifiers (divalent oxides), and SiO2 the content of silica.