Wood preservative design

Plate 8 Dipping treatment plant for antisapstain products. 

Plate 9 Vacuum-pressure impregnation treatment plant. 

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On-site treatment in batch reactors using refinery and wood-preserving waste added to soil resulted in highly variable loss of PAHs over a year (Aprill et al. 1990). An extensive study (Ellis et al. 1991) examined a number of design features, and the relative merits of on-site and off-site treatments of a... 

It is recognized that as wood preservative systems that exhibit broad-spectrum activity are phased out, there will be an increase in the use of systems that are designed to be Tit for purpose . In the area of wood modification, it is well known that some systems perform well in some situations and less well in others. There will need to be a framework of tests that recognize this fact and allow products to be licensed that perform entirely satisfactorily in service, even though they may fail the current tests as they stand at the moment. 

In several wood-preserving facilities, other wood preservatives such as creosote and chromate-copper—arsenate (CCA) have been used in addition to PCP (e.g., Lamar Glaser, 1994 Mueller et al., 1991a Mahaffey et al., 1991). Environmental contamination by chemical mixtures is likely in these sites. When PCP has been dissolved in an organic carrier such as oil, soil is also contaminated with the solvent (Trudell et al., 1994 Lamar Dietrich, 1990). Chlorinated dimeric impurities in technical CP formulations are also found in contaminated soil. Design of successful bioremediation must address the effects of other chemicals on CP biodegradation. 

Trudell, M. R., Marowitch, J.M., Thomson, D.G., Fulton, C. W. Hoffmann, R. E. (1994). In situ bioremediation at a wood-preserving site in cold, semi-arid climate feasibility and field pilot design. In Bioremediation of Chlorinated and Polycyclic Aromatic Hydrocarbon Compounds, ed. R. E. Hinchee, A. Leeson, L. Semprini S. K. Ong, pp. 99-116. Boca Raton, FL Lewis Publishers. 

This list includes sludge, still bottoms, wastewaters, spent catalysts, and residues. These are generated by specific industrial processes, such as wood preserving, petroleum refining, and organic chemical manufacturing. These are designated by prefix K [5,6]. 

Barnes HM, Amburgey TL and Sanders MG (2004) Performance of zinc-based preservative systems in ground contact. Wood Design Focus, 14(2) 13-7 Barnes HM and Murphy RJ (1995) Wood Preservation the classics and the new age. Forest Products Journal, 45(9) 16-26... 

The first Review Regulation has determined that active substances for wood preservatives and rodenticides will be evaluated first in the review process. The complete dossiers for these active substances had to be submitted to the designated competent authorities until March 28, 2004. 

Annex V specifies the Rapporteur Member States responsible to review the accepted notified substances. The notified substances in respect to wood preservatives and rodenticides (product-types 8 and 14) and to mol-luscicides, insecticides, repellants and attractants and antifouling products (product-types 16, 18, 19 and 21) are designated to Rapporteur Member States who are responsible of the evaluation of the dossiers. 

Local air pollution should be considered when designing zinc roofs, and proper fasteners should be specified. Zinc should be prevented from contacting copper and the chlorides and sulfates in concrete and mortar. Acids from certain timbers and some wood preservatives can also attack zinc. Bituminous coatings are recommended for protection. 

Aluminum Primer n (1) Primer specifically formulated for aluminum metal. (2) Primer containing a proportion of aluminum pigment, but distinguished from aluminum paints in which the aluminum is designed to float to the top of the film giving metallic brilliance, a feature undesirable in a primer. Aluminum primers are used on resinous timber or timber which has been treated with oil-soluble wood preservatives. 

Latest technological developments have yielded a full line of Registered M-GARD products designed to replace pentachloro-phenol and creosote for various wood preservative applications. 

QUINDEX N-10 SS Fungicide is a solubilized form of 10% copper 8-quinolinolate designed for use in solvent applications to protect fibrous substrate (e.g., wood, textiles, cordage, etc.) as well as coatings and adhesives from degradation and defacement by fungi. This product conforms to the American Wood Preserver s Association Specification P-8. 

Wood is painted in order to preserve from decay, to minimize changes in moisture content that lead to distortion, and for decoration. It is a waste of time and effort to apply expensive paints or stains to exterior wood not previously treated with preservative. Preservatives are designed to penetrate the timber to protect against microorganisms and insect attack. Modern preservatives can be over-coated with paint without problems. 

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