ACCELERATED LABORATORY TEST OF RUBBERWOOD ORIENTED STRANDBOARD EXPOSED TO WOOD DECAY FUNGI

• Main Authors: Esmeralda Yoshico Arakaki Okino, Marcus Vinícius da Silva, Divino Eterno Teixeira, Mário Rabelo de Souza, Marcos Antonio Santana, Cláudio Henrique Soares Del Menezzi
• Format: Article
• Language: Portuguese
• Published: Universidade Federal de Santa Maria 2009-10-01
• Series: Ciência Florestal
• Subjects: durabilidade natural; fungos xilófagos; <i>Hevea brasiliensis</i>; OSB
• Online Access: http://cascavel.ufsm.br/revistas/ojs-2.2.2/index.php/cienciaflorestal/article/view/889

<p>This work aimed to evaluate the natural durability of oriented strandboards (OSB) manufactured with strands<em> </em>of <em>Hevea brasiliensis</em> Müll.Arg. bonded with 5% and 8% of urea-formaldehyde (UF) and phenol-formadehyde (FF) resins, exposed to xilophagous fungi under laboratory conditions. In accelerated laboratory test decay, samples of OSB were exposed to the following fungi: the brown-rot fungi <em>Gloeophyllum trabeum </em>(Pers. ex Fries) Murr., <em>Coniophora puteana</em> (Schumach. : Fr.)P. Karst., <em>Meruliporia incrassata</em> (Berk. &amp; M.A. Curtis) Murrill as well as the white-rot fungi <em>Fomes annosus</em> (Fr. : Fr.) Cooke, <em>Trametes versicolor</em> (L. : Fr.) Pilát,<em> Ganoderma applanatum</em> (Pers.) Pat., <em>Bjerkandera fumosa</em> (Pers. : Fr.) P. Karst. and <em>Phanerochaete chrysosporium</em> Burds. Among the brown-rot fungi, the <em>Gloeophyllum trabeum</em> was the most aggressive, showing the highest loss of mass. <em>Trametes versicolor </em>and<em> Ganoderma applanatum</em> confirmed the preference for broadleave species. All oriented strandboards at lower UF resin contents were more degraded by <em>Phanerochaete chrysosporium, Trametes versicolor, Ganoderma applanatum, Merulia incrassata, Coniophora puteana</em> and <em>Gloeophyllum trabeum, </em>with high rate of loss of mass. <em>Coniophora puteana </em>showed small loss of mass when FF resin was applied. <em>Bjerkandera fumosa</em> showed low loss of mass only at higher resin content. Oriented strandboards exposed to <em>Coniophora puteana</em> showed insignificant OSB degradation.</p>