Wood Preservative Effectiveness of Metallic Naphthenates. 2. Evaluation of Various Properties of Treated Wood.:Evaluation of Various Properties of Treated Wood

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Wood samples treated with metallic naphthenates were evaluated for their leachability, water absorption and hygroscopicity. Permeability of the chemicals into wood was also compared among three wood species.<BR>Copper naphthenate showed a high resistance to leaching. Zinc naphthenate was inferior to copper naphthenate in leachability, especially at lower concentration.<BR>Water absorption varied with wood species, although no conspicuous difference was found between the two test chemicals. Concerning the ratio of water absorption between treated and untreated woods, the highest value was recorded by Pinus densiflora and followed by Fagus crenata and Cryptomeria japonica. In the comparison of hygroscopic ratio, P. densiflora was the highest and followed by C. japonica and F. crenata.<BR>Copper naphthenate afforded the treated wood, have nothing to do with concentration 0.5-0.8 as hygroscopic ratios. Chemicals were easily permeated into P. densiflora. However, penatration of the chemicals into C. japonica and F. crenata was restricted only to the surface layers of wood. Apart from the effect of wood species, viscosity of the chemicals, which is changeable with concentrations, appeared to influence the permeability.
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