No.3（2008）11.Resistance Against Wood Rotting Fungi and Mold by the Extractives from Foreign-made Exterior Wood

Takahiko Iida, Kensuke Kawarada, Rumi Konuma, Iwao Miyazaki

To increase the durability of solid wood, Sugi and Buna specimens were impregnated with secondary metabolite from Ipe which retains high durability. Wood specimens impregnated with extractives were examined by accelerated fungal tests using wood decaying fungi and mold.After exposure to fungal attack with wood decaying fungi such as Fomitopsis palustris, Sugi specimens exhibited less than 3% mass loss. Extractives retention after weathering treatment of Sugi and Buna specimens were 82.9% and 53.6% respectively. Moreover, both specimens demonstrated bulk coefficients which predicts the permeation of extractives into cell walls. These results indicated that the extractives of Ipe have high compatibility for wood cell walls, and durability against wood decaying fungi. Additionally, ather accelerated fungal test using mold was employed to evaluate the surface contamination resistance of solid wood specimens impregnated with extractives. Observation of the specimen’s surfaces by microscope proved that the specimens have high resistance performance against mold such as Aspergillus niger.

Keywords

Ipe,durability,extractives,bulk coefficient,wood preservatives

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