This paper briefly describes part of our preliminary work aimed at developing a test procedure that culd be adopted as a standard method. A detailed version of the work has been submitted for formal publication. In both papers, the aim is to promote interest in extended laboratory testing of wood preservatives. It is believed that this work may provide the basis of a laboratory test procedure from which predictions of field performance could be made. The results of the experiment showed that (a) decay of treated blocks increased with successive soil-jar exposure, and (b) the progressive increase in decay was greatest in blocks to the lower retention of CCA.

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