Effect of selected coatings on moisture sorption of selected wood test panels with regard to common panel painting supports

AbstractThe effect on moisture sorption of six types of coating (heat-infused and non-infused beeswax Acryloid B-72, Saran F-310, commercial poly-urethane and an uncoated control) applied to four different types of wood (mahogany, oak, basswood, poplar) was examined after exposure to repeated cycles of ambient relative humidity. Each applied coating covered the entire sample block. A two-way experimental design provided data for graphical and statistical analyses. Plots of moisture sorption versus time for three RH-cycles showed characteristic curve patterns for each wood/coating combination. An index value of sorption rate was described and calculated for each wood/coating combination. Using the Index values, analysis of variance was performed which showed that sorption was influenced by coating type, wood type, and interactions between coating type and wood type.