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    Author(s): Stan T. LebowPatricia K. LebowBessie M. WoodwardSteven A. Halverson; William Abbott; Michael M. West
    Date: 2009
    Source: Research paper FPL-RP-655
    Publication Series: Research Paper (RP)
    Station: Forest Products Laboratory
    PDF: View PDF  (824.62 KB)

    Description

    This study evaluated the ability of pressure treatments with a borax–copper (BC) preservative to protect wood exposed above ground or in contact with the ground. Stake testing indicated that the 2.3% and 4.7% BC concentrations were fairly effective in preventing decay in Wisconsin but were not effective in protecting stakes exposed in Mississippi. The 1.4% and 2.3% BC concentrations effectively protected decking specimens exposed for 5 years at the Wisconsin test site. Assay of stakes at the Wisconsin site indicated that over 90% of boron in the below-ground portion of the stakes was lost within the first year, leaving copper as the sole biocide. Assay of the decking specimens after 4 years of exposure indicated that between 30% and 45% of copper and 80% and 95% of boron was lost from the BC-treated decking specimens. These copper losses were greater than those found with the laboratory simulated rainfall study, which indicated that 5% to 6% of copper was lost from the 1.4% and 2.3% BC treatments after the equivalent of 1 year of rainfall. Boron losses of 45% to 55% were noted with 1 year’s equivalent of simulated rainfall. This series of stud­ies indicates that the efficacy of BC as a pressure-treatment preservative in exposed applications is a function of copper retention.

    Publication Notes

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Lebow, Stan T.; Lebow, Patricia K.; Woodward, Bessie M.; Halverson, Steven A.; Abbott, William; West, Michael M. 2009. Efficacy of a borax-copper preservative in exposed applications. Research paper FPL-RP-655. Madison, WI: USDA-Forest Service, Forest Products Laboratory. 11 p.

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    Keywords

    Preservatives, copper borates, stake tests, leaching, borax, copper, preserved wood, evaluation, wood preservation, wooden buildings, borax-copper, pressure-treated wood, above-ground, ground-contact, durability, leaching

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https://www.fs.usda.gov/treesearch/pubs/33881