Effect of Fine Clay Fraction on Functional Properties of Vitreous Enamel Coatings Final brittle-fracture properties of vitreous enamel coating are dependent on its structure, texture and chemical composition. The most important inorganic components during production of this coating are clay and fritted glass. Usage of various sizes of these components influences final quality of the coating. The main goal of this thesis was to compare functional properties of vitreous enamel coatings made by using commonly-dimensioned and nano-dimensioned particles.