Title: Pressure treatment with a water-based chlorothalonil formulation
Author: Lebow, Stan; Lebow, Patricia; Clausen, Carol; Halverson, Steven; Burley, Joseph
Source: Proceedings, one hundred fifth annual meeting of the American Wood Protection Association ... San Antonio, Texas, April 19-21, 2009 : volume 105. Birmingham, Ala. : American Wood Protection Association, c2009: p. 249-254.
Description: This study evaluated the ability of a waterborne chlorothalonil (CTL) formulation to penetrate into southern pine lumber during pressure treatment. Treatments with a conventional amine copper formulation were conducted for comparative purposes. End-matched specimens cut from southern pine lumber were treated using either a full cell or modified full cell (low weight) treatment schedule. Uptake (by weight gain) of preservative by the specimens was not statistically different for the CTL and amine copper formulations. For both CTL and amine copper treatments, the proportion of active ingredient was significantly greater in the outer (0-5 mm) assay zone than in the 10-15 mm or 20-25 mm assay zones. The difference between proportions of active ingredients in the 10-15 and 20-25 mm assay zones was not statistically different. The proportion of copper in the outer 0-5 mm assay zone was significantly greater than the proportion of CTL in this assay zone, meaning that copper had a steeper retention gradient. There was no statistical difference between the proportions of CTL and copper in the two inner assay zones. The gradients for the full cell and low weight schedules were not statistically different. These findings indicate that the CTL in the water-based CTL formulation penetrated the wood at least as well as the copper in the amine copper formulation, and that this CTL formulation has potential for use in pressure-treatment applications.
Keywords: Chlorothalonil, water-based, pressure treatment, southern pine, wood preservatives, testing, preservative treated wood, fungicides, molds, fungi control, pressure, wood-decaying fungi, assaying, preserved wood, fungi prevention, copper, treated wood, preservatives, chlorothalonil, penetration, copper amine
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Lebow, Stan; Lebow, Patricia; Clausen, Carol; Halverson, Steve; Burley, Joseph. 2009. Pressure treatment with a water-based chlorothalonil formulation. In: Proceedings, 105th annual meeting of the American Wood Protection Association. 2009 April 19-21. San Antonio, TX. Birmingham, AL: American Wood Protection Association, c2009. 105: p. 249-254.
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