Abstract
The biological resistance of particleboards made from sap-and heartwood of Pine (Pinus sylvestris) from trees of different ages was investigated using the brown rot fungi Coniophora puteana. The particleboards were bonded with polymeric diisocyanate (PMDI), melamin-urea-phenolformaldehyde resin (MUPF-resin), phenolformaldehyde resin (PF-resin) and tanninformaldehyde resin (TF-resin). As reference particleboards from sap- and heartwood of Douglas Fir (Pseudotsuga menziesii) and Larch (Larix decidua) were investigated using the binders PMDI, MUPF-, PF- and TF-resin as well as particleboards from sapwood of pine containing a chemical wood preservative. Generally, MUPF- and TF-bonded particleboards made from heartwood were of higher biological resistance compared with those made from sapwood using the same binder system. In case of PMDI-bonded pine particleboards the influence of heartwood on the biological resistance was almost undetectable. TF-bonded particleboards made from heartwood of 126-year-old pine (samples without leaching) showed a very high resistance towards biological attack. Leaching of particleboards prior to testing decreased the biological resistance of TF-bonded pine boards from old trees. The difference between the biological resistance of untreated and leached particle-board samples was especially high in case of TF-bonded particleboards of heartwood from old pine, whereas leaching did not seem to have such effect on the biological resistance of TF-bonded particleboards of young pine and Douglas fir and larch, respectively. The resistance of MUPF- and PMDI-bonded boards remains unaffected by leaching.
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