Biocide retention variation and gradients in commercially treated 4 by 4s

Biocide retentions for copper-based wood preservatives used for residential ground-contact applications are established through field stake tests using small research stakes cut from selected sapwood and then treated in laboratory cylinders. The results from the relatively short-term field tests are...

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Bibliographic Details
Published in:Forest products journal 2010-02, Vol.60 (2), p.190-193
Main Authors: Schultz, T.P, Nicholas, Darrel D
Format: Article
Language:English
Subjects:
bioactive properties
chromated copper arsenate
Copper
Forest products industry
heartwood
Laboratories
Management
measurement
Pinus taeda
Retention
sapwood
Studies
termiticides
Timber
wood poles
wood preservation
Wood preservatives
Woodworking industry
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Summary:Biocide retentions for copper-based wood preservatives used for residential ground-contact applications are established through field stake tests using small research stakes cut from selected sapwood and then treated in laboratory cylinders. The results from the relatively short-term field tests are then used to specify retentions for commercially treated timbers that have a range of densities and heartwood content. More than 120 4 by 4s that had been commercially treated with four copper-based systems readily available were purchased, with the posts carefully selected for good biocide penetration and a wide outer sapwood band, and analyzed for biocide retentions. Also, biocide gradients from five soluble copper and three particulate copper commercially treated 4 by 4s, all having the same labeled retention, were determined. All four systems gave a range of analyzed retentions, with some fraction of the timbers of each preservative system having a relatively low biocide level. In contrast to previous reports, the biocide gradient for wood treated with a soluble copper formulation was less steep than in wood treated with a particulate copper system.
ISSN:0015-7473
2376-9637
DOI:10.13073/0015-7473-60.2.190