The paper discusses the results of contact angle measurements undertaken on insulating material samples with artificial pollution layers of different thicknesses, which were applied on insulating material samples with various degrees of roughness. The influence of the roughness of clean surfaces on the hydrophobicity has also been investigated by contact angle measurements. It was found that the roughness is an important parameter for the degree of hydrophobicity as well as for the hydrophobicity transfer property of insulating materials. Therefore, the roughness has to be taken into account if insulating materials shall be compared to each other. Key Words: Contact angle, insulator surfaces, pollution layers, roughness, hydrophobicity transfer.     «

The paper discusses the results of contact angle measurements undertaken on insulating material samples with artificial pollution layers of different thicknesses, which were applied on insulating material samples with various degrees of roughness. The influence of the roughness of clean surfaces on the hydrophobicity has also been investigated by contact angle measurements. It was found that the roughness is an important parameter for the degree of hydrophobicity as well as for the hydr...     »