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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 B
2O
3). 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.
Keywords
Equilibrium moisture content (EMC),
water vapor sorption,
preservative treatments,
chromated copper arsenate (CCA),
alkaline copper quaternary (ACQ),
borates,
disodium octaborate tetrahydrate,
corrosion,
wood preservatives,
moisture,
wood moisture,
humidity,
adsorption,
absorption,
borates,
fasteners,
anti-corrosives,
testing,
southern pine,
preservation,
moisture content,
chromated copper arsenate,
alkaline copper quat,
preservative treated wood,
treated wood,
DOT,
hygroscopicity,
water vapor,
connectors
Citation
Zelinka, Samuel L; Glass, Samuel V. 2010. Water vapor sorption isotherms for southern pine treated with several waterborne preservatives. Journal of Testing and Evaluation 38(4): 1-5. Paper ID JTE102696.
