The objective of this study was to evaluate the tannin extraction potential taken from the bark of Acacia dealbata. This tannins were extracted with water at 90°C. An extraction yield of 17.2% solids with a Stiasny number of 82% was obtained from the bark extract of Acacia dealbata. The structure was studied by Fourier transform infrared spectroscopy (FTIR). The thermal behavior of tannins was studied by DSC and a glass-transition temperature (T g ) of 116,77°C was determined. The thermal stability of tannins was studied by TGA. At 196.91°C the decomposition is 3.7% and the maximum of the weight loss rate (DTG) of the degradation was 257.77°C. The curing with formaldehyde showed an exotherm reaction in the range of 100-120°C, which is similar to tannins of other species.

Physical and mechanical properties were evaluated in 46 year-old Pinus canariensis wood, growing in dry lands of Maule´s Region in Chile. The wood was conditioned to 12% moisture content and mechanical testing was according to Chilean standards. The basic density was 0.503 ± 0.03 g/cm 3. The results of mechanical properties were lower compared with those gotten in Spain and Australia. Concerning Pinus radiata wood, properties were within the range or over, except for perpendicular tension strength. According to chilean standard NCh1989, P. canariensis wood is classified in ES4 group, as native woods like coigüe, laurel, lenga and roble. Because of its structural properties, according to Sallenave classifications, this species is specially appropriated for building and other structural applications.

Wood drying quality and transversal permeability of Chilean second-growth Nothofagus alpina (raulí) were evaluated. Two charges of raulí sawnwood were dried in a experimental kiln. One of the charges was prepared with sawnwood from Pinto the second one was prepared with sawnwood from Collipulli. The transverse permeability to air of the material after drying was determined. The results showed that the drying rate was 25% higher and drying time was about 18% shorter for Collipulli sawnwood (from green to 12%) due to the extent of heartwood. The shrinkage, collapse and drying stress were less in the wood dried from Collipulli, while the transverse permeability was lower in the samples from Pinto.