The durability of phenolic-bonded particleboards made of decay-resistant black locust and nondurable aspen

Phenolic-bonded particleboards were manufactured containing 0 to 100 percent by weight mixture of aspen (Populus tremuloides) arid black locust (Robinia pseudoacacia) wood species. Modulus of elasticity (MOE), modulus of rupture (MOR), internal bond (IB), and linear expansion (LE) of boards were determined. Laboratory soil block culture tests were performed. IB increased with an increase of black locust in the furnish. LE, MOE, and MOR decreased with an increase of black locust in the furnish. Weight loss of boards exposed to both brown-rot (Gloeophyllum trabeum and Poria placenta) and white-rot (Coriolus versicolor and Pleurotus ostreatus) fungi was minimal on panels with high content of black locust particles. In conclusion, the incorporation of 20 to 40 percent black locust enhances IB, LE, and decay resistance of boards with minimum reduction of MOE and MOR.

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