Results of preliminary experiments carried out to study selective absorption of different constituents of CCA salts and sludge formation in commercial treatment, using Terminalia myriocarpa and Pinus kesia timbers, are reported in this paper. The objective of these experiments is to evolve simple and practical methods to prevent/minimise sludge formation and differential absorption of the constituents of the preservative in commercial treatments, without affecting the efficacy of the treatment. The results so far obtained indicate that there is disproportionate depletion of the constituents of CCA with successive charges. Further detailed investigations are in progress to study these aspects to evolve guidelines to ensure better quality control in commercial treatments. As per current practices the different ingredients of the preservative have to be replenished as and when necessary.

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