Water protection of wooden window joinery painted with low organic solvent content paints with known composition. Part 1. Results of inter-laboratory tests

Abstract

An investigation of the water protection capacity of modern paints with low organic solvent content was carried out as part of an European research project. The wider scope of the project was to establish the performance and durability of these new coatings applied to window joinery made from European softwood species. The aim of the moisture studies was to employ well-proven methods to determine the liquid water absorption of the coatings. A range of standard moisture permeability tests, carried out on coating systems applied to pine and spruce substrates, indicated a high correlation between similar data obtained using different techniques at different laboratories. The results showed that permeability of the coatings tested did not depend on the timber substrate, as long as the permeability was expressed in absolute terms and not relative to the absorption of uncoated wood. The results from this study will be used to determine whether laboratory measurements of the moisture transmission properties of a coating can be used to predict outdoor weathering performance.

Effect of wood density and cracks on the moisture content of coated Norway spruce (Picea abies (L.) Karst)

“…Constructions for outdoor purposes, such as house facades, are particularly exposed, and a coating is often used to limit the absorption of moisture. The moisture sorption behavior of coated wood has been studied extensively (Ahola et al 1999;Ekstedt 2002;Ekstedt 2003;Nejad and Cooper 2011;Van Meel et al 2011;Grüll et al 2013). However, studies on the subject are predominantly limited to the performance of the coating and do not address the relationship between coating performance and wood characteristics.…”

Assessment of moisture protective properties of wood coatings by a portable NMR sensor

“…In most studies of water transport through coating layers one investigated the average moisture content (MC) in bulk wood. [3][4][5][6][7][8] However, it has also been demonstrated that the spatial distribution of water close to the surface is inhomogeneous. [9][10][11][12] Typically, the MC does not reach a steady state but is continuously responding to changes in environmental conditions.…”

Effect of some formulation parameters on the penetration and adhesion of water-borne primers into wood

“…Numerous pieces of environmental legislation have been established or will be introduced throughout Europe. This evolution in combination with the skyrocketing solvent prices, negative trends on the wood market and public concern over the use of tropical wood species have resulted in problems for the European joinery and coating industry (Ahola et al 1999). Although coating systems with reduced pollution output and energy requirements have been available for many years (e.g.…”