Laboratory preservative-efficacy tests were conducted using boric acid-triethanol amine (BTEA) solution in accordance with the JIS A 9201 (1991) test method excluding the standard weathering process. Sapwood specimens of Picea jezoensis or Fagus crenata to achieve nominal retentions of 0.40-41.2 kg/m³ of boric acid were exposed to Tyromyces palustris, Coriolus versicolor, Serpula lacrymans or Chaetomium globosum, respectively. Mean percentage mass loss data showed the following threshold values: 1.65-2.13 kg/m³ for Tyromyces palustris; 1.60-1.94 kg/m³ for Coriolus versicolor; 0.43-0.83 kg/m³ for Serpula lacrymans; 8.0-23.8 kg/m³ for Chaetomium globosum. The values against Coriolus versicolor and Serpula lacrymans were lower than those of Tim-Bor® as boric acid retention.

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