TY JOUR TI MODIFICATION OF SYNTHETIC RAW MATERIAL BASED ON SODIUM HYDROXIDE FOR PRODUCING GLASS KW SRM for the production of sodium-calcium-silicate glass KW sodium hydroxide KW phase state diagram Na2O-SiO2 Krachek JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Rasseko, D.S. AU Lavrov, R.V. PY 2021 IS 6 PB Belgorod State Technological University named after V.G. Shukhov