Influence of Surface Treatments on the Properties of Weathered Particleboards

For an improvement in the performance of directly weathered particleboards, four different surface treatments have been tested. These treatments, with different water vapor permeances and different degrees of water repellency, were applied to urea- and phenol-formaldehyde resin-bonded particleboard samples. The samples were exposed to natural weathering for approximately 3-1/2 years. The changes in appearance, the reduction of the MOR and the shear strength, as well as the irreversible thickness swelling have been recorded. The results show the effectiveness of water repellent treatment. The water vapor permeance of the treatment proves to be, below a certain maximum value (e.g., 2 gr./ft.2 hr. in Hg.), of minor importance.

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