The study determined the maximum thickness of rubber wood that can be diffusion treated and the effect of diffusion storage period on the distribution of chemicals in treated wood of various thicknesses. Wood of thickness up to 50 mm can be easily diffusion treated with 10% boric acid equivalent (BAE) solution to adequate loading of chemicals. The optimum diffusion storage period to get uniform and adequate distribution of chemicals in the treated wood is two, three, nine and twelve weeks for 25, 50, 75 and 100 mm thick wood respectively.

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