The great potential of silanes for starch modification and their utility as surface wood protection is still not sufficiently assessed. The work aimed to analyze the crosslinking process's effect on starch modification with silane and tested the hydrophobic properties of surface-treated wood. The starch treatment was modified with methyltrimethoxysilane or N-octyltriethoxysilane. SEM-EDX with a cryogenic preparation system was used to estimate the surface structure. Water contact angle measurement was performed to determine the hydrophobicity of silane-coupling agents. The hydrophobic properties of wood with starch-silane treatment depend on the method of preservation and conditioning samples, the structure of the silane, and the concentration of starch and silane. Starch modified with methyltrimethoxysilane performed excellent and permanently against leaching, hydrophobic properties of wood.

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