Preservative efficacy of copper naphthenate (SANPRESER-OGR) was evaluated in the laboartory and field trials when timber was treated by brushing. Results of field trial indicated that service life of the brush-treated timber could be approximately 10 years or longer under ground contact conditions, although life span was slightly varied with timber species and test sites. After four years' exposure in the field, the treated stakes remained resistant against termite attacks. These results strongly susgested the potential of copper naphthenate as a wood preservative for brush treatment of timber.

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