A resin-compatible copper naphthenate to preserve aspen composites

Recent examples of decay in wood composite siding and sheathing in the United States have demonstrated the need for preservative protection. Experimental oriented strandboards were made using aspen, slackwax, and a resole-type liquid phenol-formaldehyde resin containing a water-dilutable amine-based copper naphthenate formulation. At loadings of approximately 0.1 percent copper, boards had a brown color and low odor after pressing, with no drop in mechanical properties (except wet modulus of rupture). However, bioassay results suggested a level of copper higher than 0.1 percent would be required to prevent decay.

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