Influence of natural durability, laboratory weathering, resin content, and ammoniacal copper arsenate treatment on the decay resistance of African hardwood particleboards.
1984
Okoro, S. P. A. | Gertjejansen, R. O. | French, D. W.
Particleboards made from ring-flaked Ghanaian hardwood chip mixtures, and treated with varying concentrations of ammoniacal copper arsenate (ACA) were tested for resistance to Coriolus versicolor and Gloeophyllum trabeum, in standard ASTM soil-block tests. Vacuum-pressure-soaking and accelerated aging reduced initial IB of all panels and significantly increased IB losses during the soil-block test, particularly of the untreated panels and panels treated with ACA at 0.2 lb/ft3; these treatments also resulted in increased wt. losses due to decay. G. trabeum was more tolerant of ACA than C. versicolor. Treatment with ACA reduced initial IB, but also reduced the losses in wt. and IB of weathered boards that resulted from the presence of decay fungi. A higher PF resin content resulted in higher initial IB and higher IB after weathering and the soil-block test. The most decay-resistant species had the highest densities, and panels containing these species had lower IB, both before and after the soil-block test because of the low compaction ratios.
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