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O conhecimento acerca da resistência dos compostos ligno-celulósicos ao ataque de microrganismos é primordial para servir de base à prevenção da deterioração e a correta destinação de emprego do material. Nesse sentido, avaliou-se a resistência natural a fungos apodrecedores de painéis aglomerados confeccionados com partículas de madeira (Eucalyptus grandis) e/ou bambu (Bambusa vulgaris). Foram produzidas, em laboratório, chapas aglomeradas nas dimensões 50x50x0,95cm e massa específica pré-estabelecida em 0,70g cm-3, nas proporções de 100:0, 75:25, 50:50, 25:75 e 0:100 de madeira e bambu, respectivamente. A massa de partículas representou 91% da massa seca de cada painel, sendo, o restante, formado pelo adesivo ureia-formaldeído (8%) e parafina (1%). Para determinação da resistência natural ao ataque de fungos xilófagos, os painéis foram testados em laboratório e utilizados os fungos Gloeophyllum trabeum (podridão parda) e Trametes versicolor (podridão branca), de acordo com a ASTM D 2017 (2005). Quanto aos resultados, foi observado que os painéis confeccionados com mistura de partículas de madeira e bambu apresentaram menor resistência ao ataque dos fungos apodrecedores. Painéis que utilizaram apenas bambu ou madeira apresentaram resistência biológica semelhante. Dentre os fungos, T. versicolor atacou mais severamente os painéis. The knowledge about lignocellulosic compounds strength to the attack of microorganisms is essential for preventing deterioration and also for knowing the correct usage of the material. Accordingly it was evaluated the natural resistance of wood panels made of particles of wood (Eucalyptus grandis) and/or bamboo (Bambusa vulgaris) to decay fungi. Particleboards were produced in laboratory, each of them with dimensions 50x50x0.95cm and density pre-set at 0.70g cm-3, in proportions of 100:0, 75:25, 50:50, 25:75 and 0:100 of wood and bamboo, respectively. The particles mass represented 91% of the dry mass of each panel while the remainder was formed by the urea-formaldehyde adhesive (8%) and paraffin (1%). The panels were tested in the laboratory and Gloeophyllum trabeum (brown rot) and Trametes versicolor (white rot) were used to determine the natural resistance to attack by wood decay fungi. It was observed that panels which were made with a mixture of particles of wood and bamboo were less resistant to attack by decay fungi. Panels that were made from bamboo or wood only showed similar biological resistance. Among fungi, T. versicolor was the one that attacked panels more severely

Durabilidade natural de painéis aglomerados confeccionados com Eucalyptus grandis e Bambusa vulgaris em ensaio de apodrecimento acelerado