(Received 18 August 2009; accepted 9 December 2009)
Published Online: 2010
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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.
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