TY JOUR TI LOW-MELTING UNFRITTED GLAZE IN THE MATERIALS SYSTEM "QUARTZ SAND-ULEXIT-SODA-FELVESPATCH CONCENTRATE KW jade glazes KW rational choice of raw materials KW composition modeling KW calculation of properties KW production of glaze slips KW vitrification of slips KW quality of glaze coatings. JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Onishchuk, V.I. AU Ageeva, S.V. AU Doroganov, E.A. PY 2021 IS 6 PB Belgorod State Technological University named after V.G. Shukhov