Influence of moisture content on the contact angle and surface tension measured on birch wood surfaces

Abstract Surface tension of solid wood surfaces affects the wettability and thus adhesion various adhesives coatings. By measuring contact angle wood, surface can be calculated based on Young-Dupré equation. Several publications have reported measured with different test liquids, under conditions. Results only compared if conditions are similar. While roles drop volume, image shooting time etc., widely recognized, role moisture content (MC) is not evaluated in detail. In this study, effect values, distilled water diiodomethane, sanded birch ( Betula pendula ) was investigated, order to find relationship between them. With increasing MC from approximately 6% 30%, (decreasing tension) values were according a logarithmic function. The function makes possible calculation angles that correspond MCs.