Boron effect on decay resistance of some fire-retardant coatings applied on plywood surface was studied. Boric acid (B) was mixed into aqueous trimethylol melamine (TM) solution to increase the fixation in wood. To reveal the decay resistance of boric acid-added formulations, coatings were applied over radiata pine plywood surface as 100 g/m 2 amounts. Phosphoric acid (P) and dicyandiamide (D) were also used alone or in mixtures as reference coatings for comparison. Coated specimens were exposed to weathering according to Japanese Industrial Standard ]IS A 9201 (1991) as severe leaching for 10 cycles, prior to decay test. Non-leached and leached specimens, then, were inoculated with a brown-rot fungus Tyromyces palustris and a white-rot fungus Coriolus versicolor. Extent of the fungal attack was determined by mass loss of the specimens after 12 weeks incubation and microscopic examinations by 6 x magnification. Results indicated that TMB and TMDB coatings imparted the panels complete decay resistance despite severe weathering conditions and were proved superior over all other alone and mixture coatings. Although other combinations and alone treatments used in the study were also effective to inhibit the fungal damage before weathering, leaching greatly reduced their protective efficacy. Surface characteristics of decayed specimens were consistent with the determined values of mass losses caused by fungal attack. TMB and TMDB coatings were remarkably effective in maintaining sound surface properties after exposure to weathering and decay fungi. Pilzhemmende Wirkung des Bors in feuerhemmenden Anstrichen yon SperrholzDie Pilzhemmende Wirkung einiger feuerhemmender Anstriche ffir Sperrholz wurde untersucht. Bors~ure (B) wurde mit Trimethylolmelamin (TM) gemischt, um die Fixierung im Holz zu verbessern. Sperrholz aus Pinus radiata wurde mit 100 g/m 2 dieser L6sung bestrichen. Weiter wurden Phosphors~iure (P) und Dicyandiamin (D) allein und in Mischung mit Bors/iure untersucht. Vor dem Abbautest wurden die Proben nach japanischem Standard mit 10 Auswasch-Zyklen bewittert und anschlieflend mit Braunf'aule ( Tyromyces palustris) und Weiflfiiule ( Coriolus Correspondence to: M. Kemal Yalinkilic; emaih mustafa@termite.kuwri.kyoto-u.ac.jp and mustafa61 @yahoo.corn versicolor) beimpft. Die Beurteilung erfolgte nach 12 Wo-. chen anhand des Massenverlustes und durch mikroskopische Beobachtung bei 6facher Verg6flerung. Mit TMB und TMDB wurde trotz der scharfen Bewitterung eine vollst~indige Hemmung erreicht.Sie waren allen anderen Kombinationen fiberlegen, die zwar ebenfalls Pilzhemmung zeigten, aber aufgrund starker Auswaschung beim Bewittern ihre Schutzwirkung einbfiflten. Die Oberflachenbilder der Proben entsprachen dem Massenverlust durch den Pilzabbau. TMB und TMDB wirkten sich auch gfinstig auf die Erhaltung der Oberfl/ichengfite nach Bewitterung und Pilzbefall aus.
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