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Forest Products Laboratory
One Gifford Pinchot Drive
Madison, WI 53726-2398
Phone: (608) 231-9200
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Title: Adhesive bonding of wood treated with ACQ and copper azole preservatives

Source: Forest products journal. Vol. 56, no. 9 (Sept. 2006): p. 90-93.

Author(s)Lorenz, Linda F.; Frihart, Charles

Publication Year: 2006  View PDF »

Category: Journal Articles

Abstract: Treated wood has generally been more difficult to bond than untreated wood for a variety of reasons. Alkaline copper quat (ACQ) and copper azole (CA-B), the most prominent substitutes for chromated copper arsenate (CCA), are difficult to bond consistently. Using a phenol-resorcinol- formaldehyde (PRF) adhesive formulated for bonding to CCA-treated wood, we examined the bonding of southern yellow pine treated with CCA, ACQ, or CA-B. In durability tests, bonds were not as durable in the ACQ-or CA-B-treated southern yellow pine as in the CCA-treated or untreated pine as measured by delamination. Using differential scanning calorimetry (DSC), we determined that the adhesive tends to react more quickly with ACQ-or CA-B-treated southern yellow pine than with untreated or CCA-treated southern yellow pine. A hydroxymethylated resorcinol primer (HMR) did not penetrate as well into ACQ-or CA-B-treated southern yellow pine as into untreated wood, suggesting that PRF penetration is not as effective in treated wood. However, the HMR primer was able to reduce the extent of bond delamination of treated southern yellow pine bonded with PRF.

Keywords: Preservative treated wood, wood preservatives, adhesives, calorimetry, plywood, delamination, durability, southern yellow pine, CAz, preservatives, ACQ, bond strength, phenols

File size: 107 kb(s)

This publication is also viewable on Treesearch:  view
RITS Product ID: 22807
Current FPL Scientist associated with this product
Frihart, Charles R.
Research Chemist

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