In Sweden partial impregnation to 10 mm depth of the pine sapwood (class B in the Nordic preservation standard) of joineries was introduced during the seventies. To avoid product quality problems, organic solvent-based systems have been used. However, the Swedish industry today has problems with organic solvents, mainly for environmental reasons. We have studied raising of the grain and deformation of pine impregnated with water-based systems to 10 mm depth of the sapwood. Pine treated with water and the so-called Royal-process has been compared with pine treated with a commercial white spirit-based preservative. For the water-impregnated material we have received approximately the same results as for the Royal-impregnated products. The Royal-process is used in Sweden for windows. Our conclusion is that water-based preservatives could be used for treatment of joinery without product quality problems.

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