Dependence of the Hydrogen Permeability Coefficient in Glasses of the Sodium-Silicate System on the Silica Modulus

The system Na^sub 2^O - SiO^sub 2^ used in designing compositions for producing gas microcontainers (microspheres) is investigated. Based on a known equation, an expression is obtained for the dependence of the hydrogen permeability coefficient of glass on its silica modulus. It is established that the alkaline modifier even in the form of an impurity can influence gas permeability. A conclusion is made on the need to apply criterial valuations in designing glasses. A nomogram is obtained for determining the silica modulus, hydrogen permeability coefficient, phase composition, and probability of glass formation in the Na^sub 2^O - SiO^sub 2^ system.[PUBLICATION ABSTRACT]