Moisture protection of wood coatings and its sensitivity to mechanical defects depending on surface hydrophobicity and solid content

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Abstract
The moisture protection of wood coating systems is influenced by the total solid content applied as well as by the hydrophobic properties of the coating film. Water permeability, water vapour permeability and contact angle of water on wood surfaces treated with 21 different coating systems were measured. Water permeability tests were also carried out with artificial mechanical defects of the surfaces. The results showed that the influence of the total solid content applied was predominant, whereas the surface hydrophobicity was less efficient. Systems with a higher total solid content and in particular with continuous coating films showed a higher sensitivity to mechanical defects.

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