In this study spruce (Picea excelsa) and Beech (Fagus orientalis) wood acetylated and has been subjected of artificial weathering in difference times (0, 50,150&300 h), then wood surface analyzed using Scanning Electron Microscopy (SEM). The SEM results shown that the surface of wood exposed to weathering undergoes distinct physical changes and the surface degradation appears to be directly proportional to the time of exposure to the weathering conditions. Changes were minor in samples weathered after 50 h. Physical changes after weathering in acetylated samples lower than un treated samples. SEM observation visualized the formation of the large surface check along the fiber lengths in the un treated specimens, but checks were dispersed over the surface with small sizes in the treated ones. The changes observed in the SEM of the surfaces after acetylated Beech and Spruce wood samples were subjected to 150 and 300h weathering are minor compared with untreated wood samples. physical changes (surface checks and color) in Beech wood is lower than spruce wood. Acetylation of the wood servers to protect the surface from the weathering effect of light and water.

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