The Double-Diffusion Method of Treating Wood: A Review of Studies

This paper gives a detailed account of experiments conducted over the past 23 years on the double-diffusion method of treating wood. Most of the work described was done at the U.S. Forest Products Laboratory. The double-diffusion method consists of soaking green wood first in one chemical solution and then in a second solution. The chemicals, being water soluble, diffuse into the free water in the wood, wherein they react with each other to form a relatively insoluble, non-leachable compound that is toxic to fungi and insects. The paper covers selection of chemicals, treatment of posts in tanks, tests on softwood and hardwood species, Hawaiian species, Puerto Rican species, field tests, treatment of lumber, cooling towers, marine-exposure tests, and performance of various species.

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