Scots pine (Pinus sylvestris) sapwood is per definition (EN-350-2) easy to treat. Combined with its good availability on the European markets, it is a construction and building material in demand. However, partially large differences in penetration are reported from industry and research. To keep a reliable product quality, impregnation processes are aligned to the material most difficult to treat. Hence, it is crucial to know about the factors inhibiting the fluid flow into the material. Scots pine samples from a wide geographic distribution, 25 different sites in 6 different countries in northern Europe, have been collected and impregnated with an aqueous monomer furfuryl alcohol solution. From each of the respective sites logs of 1.3 meter in length were collected from nine trees belonging to three different breast height diameter classes. Three trees from each dominance class were chosen randomly. The log was drawn from the felled stem in a height of 1.2 meters with exact marked north/south exposition. Sapwood slabs, orientated in the cardinal directions, underwent a drying procedure at 40°C for 48 h and small clear samples of 20 x 20 x 50 mm were prepared from this material. A large variation of the ratio of filling was found for the material tested. Diameter as well as sample origin seem to influence the materials permeability.
Keywords: Geographic origin, permeability, RoF, Scots pine sapwood
Authors
Zimmer K.
Norwegian University of Life Sciences, Department of Ecology and Natural Resource Management, Ås, Norway
Larnøy E.
Norwegian forest and Landscape Institute, Ås
Høibø O.
Norwegian University of Life Sciences, Department of Ecology and Natural Resource Management, Ås, Norway
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