Wood samples treated with ammonium copper quat (ACQ-1900 and ACQ-2200), Chromated copper arsenate (CCA), Tanalith E 3491 and Wolmanit CX-8 have been studied in accelerated weathering experiments. The weathering experiment was performed by cycles of 2 hours UV-light irradiation followed by water spray for 18 minutes. The changes on the surface of the weathered samples were characterized by FTIR Spectroscopy and color measurements on the samples with 0, 200, 400 and 600 hours of total weathering. The objective of this study was to investigate the changes created by weathering on impregnated wood with several different wood preservatives. This was performed study, accelerated weathering using UV irradiation and water spray was used to simulate natural weathering. FTIR and color measurement was used to investigate the changes after several intervals (0- 200 h- 400 h- 600 h) in artificial weathering of treated and untreated wood.

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