The shower test quantifies the amount of specific preservative components which leach from treated timber under simulated open storage conditions. The test method measures leaching from both organic and inorganic salt treated timber. Shower tests of CCF, CCZF, CCB and Cu-quat treated timber which have been performed over the last 5 years by TNO are reviewed and compared. Leached components are quantified in relation to their retention in the treated product and described by use of a leaching factor. The leaching of components as a function of time and temperature (i.e. fixation) and the influence of several material and process variables is further considered.

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