In this study, the change in surface properties based on the heat-treatment temperature of SiO₂-Al₂O₃-CaO-ZnO-Na₂O system glass was analyzed using Raman spectroscopy. Viscosity prediction for each temperature was also conducted through the Vogel–Fulcher–Tammann model using differential thermal analysis and the temperatures (T_g, T_S, T_1/2) representing the thermal properties observed under hot-stage microscopy. The surface roughness, hardness, and glossiness of the glass were analyzed according to the heat-treatment temperature. Raman spectra measured at 800-1300 cm^-1 were deconvolved to observe the area and peak position changes of Q_n (n = 1-4) units in terms of melt viscosity and polymerization, and the study confirmed that the polymerization degree of the heat treated glass was the lowest at 1120 °C. Results showed that the average roughness of the glass heat-treated at 1120 ℃ for 90 min was the lowest (53.07 nm), and the hardness was the highest at 6.73 GPa

Keywords: Glaze, Sintering temperature, Raman spectroscopy, Surface roughness, Micro-Vickers hardness.