Field tests were carried out in São Paulo State - Brazil, to evaluate pre-treatment formulations of O-Phenyl-Phenol (OPP) based products. The Sodium Pentachlorophenate solution was used as a reference formulation. The treated test blocks were stacked in a covered shed, and in an uncovered place for air drying. The evaluation was done by measuring the percentage of stained surface on each test block, and the effect of the sodium tetraborate on the OPP fixation was also tested. Statistics analyses allowed to correlate the factors exposition, treatment, among others, indicating that the OPP 2.1% plus sodium tetraborate, showed the best performance.

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