The article is concerned with the preliminary experimental investigation of varying the linear extension of glass in composition of the glass-metal composite on basis of steel 20 (st20) and glass S52-1 when heated to transition temperature from the solid state to the high viscous one. The characteristic temperatures of glass-transition (T_g) and softening (T_f) and the glass transition from the solid state to the high viscous one (∆T_g) were determined. In order to determine the basic parameters in the approximated model of the coefficient of linear thermal expansion, the linear rate of variation was fixed in the vicinity of the glass-transition temperature and softening temperature. The simulation was based on the Williams-Landel-Ferry relation and Sanditov’s model of delocalized atoms. The statistical processing of results was carried out using small samples, and the experimental investigation of changing the temperature parameters under conditions of varying the rate of heating was planned.