In this study, the decay resistance of propionylated beech was investigated against the white rot fungus Trametes versicolor. Iranian beech (Fagus orientalis) was modified with propionic anhydride at different temperatures, concentrations and times without using any catalyst. Different weight percentage gains (WPGs) were obtained under different conditions. The decay resistance of the esterifed wood was studied according to ASTM D 1413 standard against the white rot fungus Tramets versicolor. WL due to decay by the fungus was reduced when WPG increased. A WPG of 17 % was found to be the protection threshold of the propionylated wood.

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