Soil block, fungal cellar and field stake test data will be presented for micronized copper systems. The copper portion of the formulations is present as a fine dispersion of "micro" particulates while the co-biocide is present as either a soluble quat or an azole containing emulsion. This testing generally used the amine based counterpart as the control preservative system and the micronized formulations perform as well or better than the amine formulations. In 5 year field stake tests in Gainesville, FL, the micronized copper quaternary formulation significantly outperformed the amine copper quaternary formulations. Strength and fixation testing is also discussed.