Micronized copper wood preservative systems were launched commercially in May 2006. Now, over 75% of the residential lumber produced in the USA is treated with micronized wood preservative formulations. Although considered controversial at first, the mode of action of micronized copper has been clearly defined by multiple authors over the years, as well as a need for a co-biocide in water-borne systems. Additionally, micronized copper systems have proven qualities such as reduced leaching, reduced selective adsorption of actives and reduced fastener corrosion. This paper further elucidates the efficacy of micronized copper in multiple systems and discusses the “Reservoir Effect” for micronized systems.

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