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The article describes the research on the effectiveness of hydrophobisation of ceramic brick surface by using a formulation based on polymers. Each series of the specimens is subjected to a process of hydrophobization on the surface by immersion for 15 s by using polymer, the structure which was further modified by the addition of nanosilica and sonicated with power of 400W. In order to determine the average absorption of polymer by the samples in the respective series before the hydrophobization, the specimens were dried to a constant weight and weighed. Then, after 14 days of immersion in the formulation, samples were weighed again to determine the percentage change in the weight relatively to the weight of the dried sample. Hydrophobicproperties of the nanofilm created on the surface of the brick were determined by measuring the surface free energy γ s (SFE) with the use of Owens – Wendt method through the designation of contact angles of specimens surface with distilled water (strongly polar liquid) and diiodomethane (apolar liquid), dispersive component γ sd and the polar component γ sp (expressed in mJ/m2). The effect of polymer use and the method of modifying the structure to the hardness of the samples in relation to the hardness of the standard samples was determined. In order to measure the hardness, the Vickers method was applied with a load of 10 kgf. On the basis of the obtained results, the effect of sonification and nanosilica use on some adhesive and physico – mechanical properties of tested material surface was specified.
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