Six kiln dried radiata pine sapwood packs of timber were preservative treated with copper-chrome-arsenic preservative using a modified Bethell treatment schedule. The packs were then subjected to simulated rain leaching at specified periods after treatment. Higher chromium leachate was obtained when higher volumes of simulated rainfall were applied. Lower chromium leachate was obtained for timber packs held under cover at ambient temperature for longer periods prior to leaching. A standard system for measuring the leaching potential of multisalt preservatives using simulated rain wetting is recommended, to allow a comparison of new products and processes around the world.

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