For testing chemicals for the wood against degradation agents of biotic, known as preservatives, both testing in the laboratory and in the fields are used. Field trials (Cemetery stakes) are often accepted as more "real" whose frequency of observation is set to more or less a year in temperate climates and six months or less in tropical situations, taking into accounts the aggressiveness of the soil. For such proposals, the wooden stakes for these trials are 50 cm long by 5 cm wide and 2.5 cm thick, universally standardized test, although the criteria for classification of damage on the test varies from place to place and laboratory to laboratory. The results of these field tests with stakes are reliable, serve as an indication of both the mechanisms of degradation of the destroyers agents of wood in that site, to evaluate the effectiveness of the durability induced with chemical preservatives. Considering time as critical observation period, testing mini test tubes, 20 cm long, 2 cm wide and 0.8 cm thick, slightly larger than those used in terrestrial laboratory microcosm, shortening the time of observation. For this purpose three chemicals CCA, ACQ and CCB in three concentrations, and five Venezuelan hardwoods specie were tested: Ceiba pentandra, Parkia pendula, Catostema commune, Alexa imperatricis, Didymopanax morototoni from natural forests of the Venezuelan Guayana and a wood of coniferous (Pinus caribaea var. hondurensis) from the plantations Uverito Monagas State.

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