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Testing method for the treatability of wood
1994 - IRG/WP 94-40031
In order to test and classify the treatability of wood species in pressure treatment processes with water-based solutions, a laboratory method was developed which allows the testing of small samples and limited sections of a stem, e.g. sapwood. The penetration of different liquids was determined separately concerning the three anatomical directions of wood. The common parameters for pressure impregnation were used on sap- and heartwood of eight indigenous and tropical wood species. An elastic epoxy resin proved feasible for coating the samples on five sides. From the data of the testing method a measure for the treatability was calculated, allowing to classify wood species into four treatability classes analogous to prEN 350-2 (1993).
A O Rapp, R-D Peek


Morphological and Impregnability Properties of Narrow-Leaved Ash (Fraxinus angustifolia Vahl.) Wood Taken From Plantations with Different Spacings
2009 - IRG/WP 09-40475
Narrow-Leaved Ash, an important hardwood in Turkey, (Fraxinus angustifolia) is one of the fast growing species. In Turkey, several plantations have been established for 40 years. Narrow-Leaved Ash grows very fast and produces 25 (m3/year) mean increment. Except for eucalyptus and poplar, this increment is the highest compared to the other imported fast growing wood species. Until 1980, the spacing on ash plantations was 3x2 m (1666 number/ha) and 3x2.5 m (1333 number/ha). Later, the spacing changed from 3.7x3.7 (730 number/ha) to 4x4 m (625 number/ha). This study investigated the morphological properties and the treatability of woods through chemical impregnation. The wood samples were obtained from narrow-leaved ash (Fraxinus angustifolia Vahl.) plantations with different spacings. Tangential and radial diameters of earlywood and latewood traces and the fiber length, lumen width, signal wall thickness and rays in per mm2 were measured and determined for wood samples coming from different spacings. The results showed the importance of spacing on wood quality and how to optimize the spacing to produce wood with high quality fiber and high quality impregnability properties based on the demands of the forest industry.
C G├╝ler, H Ibrahim Sahin, S Sen