The possibility of producing dull low-melting glazes for ceramic products to be fired according to a slow firing regime based on the system Na_2O - MgO - CaO - B,O, - A1_2O_3 - SiO_2, is demonstrated. The results of studying glaze glasses and coatings by x-ray phase analysis, electron microscopy, infrared microscopy, etc. are described. A correlation between the structure and the phase composition of coatings and their qualitative characteristics is established. The main properties of synthesized dull glazes are specified. Household majolica and pottery are becoming increasingly popular. Producers appreciate the possibility of using inexpensive local argillaceous materials, whereas consumers appreciate high artistic qualities reviving the traditions of folk crafts. Dull glazes used for decorating majolica products impart diverse types of textures to the majolica surface and conceal the heterogeneity in color tones that is typical of majolica. Furthermore, a glaze coating can improve the service properties of an article and decrease its disadvantages, such as high porosity, high water permeability, and low mechanical strength.
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