Fungicidal and termiticidal efficacy of copper and zinc naphthenates was appraised according to Japanese standardized laboratory testing methods. Copper and zinc naphthenates succeeded in protecting wood from decay fungi at retentions of 0.5 and 1.0 kg/m³ as metal, respectively. [JIS A 9302 (1976)] when they were applied to vacuum/soak impregnation [JIS A 9301 (1976)]. With respect to the fungicidal performance in superficial treatment, copper naphthenate was sufficiently effective at a treating strength of 2% as Cu and zinc naphthenate was at 3% as Zn after mild weathering cycles prescribed in JWPA Standard 1 (1979). Their termiticidal effectiveness was satisfactory at 1-2% in wood block tests [JWPA Standard 111) (1981)] in which Pine sapwood specimens treated by brushing were exposed to subterranean termites for three weeks.

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