Evaluation of adhesives for bonding borate-treated flakeboards

Flakeboards containing 0, 0.5, and 5.0 percent TIMBOR were bonded with powdered and liquid phenolic resins and an isocyanate adhesive and evaluated for strength and water properties. Phenolic-bonded boards showed large reductions in internal bond (IB) and modulus of rupture (MOR), and a substantial increase in thickness swell (TS), with increasing borate content. The addition of borate to the isocyanate-bonded boards caused less bending strength loss and increase in TS than with the phenolic resins, while IB values were not affected by the presence of borates.

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