Prediction of Plywood Bond Durability

A brief description is given, and reference is made to a detailed description of research which was established to demonstrate the feasibility of developing a method for predicting the service life of plywood from its performance when subjected to accelerated weathering treatments in the laboratory. A correlation between the strength of plywood after successive cycles of boiling and drying and the strength after successive months of exposure to the weather has been demonstrated for phenolic resin adhesives of four strength values. This was done for both painted and unpainted Douglas-fir plywood. A method is demonstrated for using this information to predict the service life of plywood made with a new glue or with new variations of old glues. The data are interpreted as affirming the evidence provided by earlier research that the higher the wood failure the greater the durability. The results also affirm the worth of the methods of evaluating the bond quality of exterior plywood specified by CS45-55 and CSA0121-57.

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