HYDROPHOBISATION COMPOSITION, METHOD FOR HYDROPHOBISATION AND SUBSTRATE

摘要

The invention relates to a hydrophobisation composition, which comprises a hydrophobisation extract, which is obtained by extracting outer bark of birch in an organic and/or polar solvent and which comprises at least 30 weight-% betulinol. The invention relates also to a method for hydrophobisation of a surface, which comprises steps of applying a layer of hydrophobisation composition comprising betulinol on a surface of a substrate, and drying and heat-treating the layer of hydrophobisation composition. Further, the invention relates to a substrate having a surface which is hydrophobised by using the said method.