This study aims to investigate the structure of raw opaque glazes with different additives for sanitary porcelain.

Using a standard raw glaze composition (raw materials: feldspar, kaolin, quartz, dolomite and ZnO) a series of glazes with 3% and 5% of TiO₂ (rutile and anatase), ZrO₂ and SnO₂ were synthesized.

The glazes were prepared using the traditional ceramic route applied on the green ceramic substrate by spraying and then thermally treated in electrical furnace at maximum temperature of 1250 ⁰C, 1 h plateau.

The resulted glazes were characterized by X-ray Diffraction, FT-IR Spectroscopy and NMR.