To estimate the wood durability in a short term, periodical weight determination was carried out in a laboratory test. This test provided the results comparable to those of the field test and the fungus cellar test, but it required much more jobs in comparison to the usual accelerated laboratory test. To save the time and jobbing for this method, a new equation was devised from simple two assumptions. The equation obtained here proved to trace the whole time course of mass loss which containing an initial time lag and a final saturation of mass loss. The combination of the periodical sampling and the curve fitting provides a useful way to determine the wood durability by the laboratory test.

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