A research study was conducted to determine the natural durability and treatability of heartwood of some lesser used or unused wood species. The treatability of species has been studied along with certain anatomical concepts association with preservative penetrability of the wood. It was observed that grain structure and presence of tyloses appeared to be correlated with penetrability of the wood. The retention of the preservative chemicals through heartwood have been determined by ASOMA X-ray analyzer. The species were classified into four treatability groups according to the degree of heartwood penetrability which will help the user to select the proper treating process. A stake yard test on these indigenous species was carried out to determine their natural durability. Based on the result, durability classification of these timbers has been made. Depending on this group user can select the species for treatment and particular use.

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