Journal Published Online: 21 January 2010
Volume 38, Issue 4

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



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
Forest Products Laboratory, U.S. Forest Service, Madison, WI
Glass, Samuel
Forest Products Laboratory, U.S. Forest Service, Madison, WI
Pages: 5
Price: $25.00
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Stock #: JTE102696
ISSN: 0090-3973
DOI: 10.1520/JTE102696