Volume 38, Issue 4 (July 2010)

    Water Vapor Sorption Isotherms for Southern Pine Treated with Several Waterborne Preservatives

    (Received 18 August 2009; accepted 9 December 2009)

    Published Online: 2010

    CODEN: JTEOAD

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    Abstract

    Equilibrium moisture content (EMC) was measured over a range of relative humidities at 22.5°C to determine whether certain wood preservatives increase the hygroscopicity of southern pine (Pinus sp.) The treatments studied were alkaline copper quaternary (ACQ) at a retention of 6.6 kg⋅m−3, chromated copper arsenate (CCA) at 6.9 kg⋅m−3, and disodium octaborate tetrahydrate (DOT) at 3.8 kg⋅m−3 (equivalent to 2.6 kg⋅m−3 as B2O3). All treatments examined increased the EMC at relative humidities above 60 %. Wood treated with DOT was the most hygroscopic. At high relative humidities, the ratio of the EMC of ACQ-treated wood to CCA-treated wood was 1.08. It is unlikely that the higher corrosiveness of ACQ compared with CCA is due to this slight increase in hygroscopicity.


    Author Information:

    Zelinka, Samuel L.
    Materials Engineer, Forest Products Laboratory, U.S. Forest Service, Madison, WI

    Glass, Samuel V.
    Research Physical Scientist, Forest Products Laboratory, U.S. Forest Service, Madison, WI


    Stock #: JTE102696

    ISSN: 0090-3973

    DOI: 10.1520/JTE102696

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    Author
    Title Water Vapor Sorption Isotherms for Southern Pine Treated with Several Waterborne Preservatives
    Symposium , 0000-00-00
    Committee G01