Repák, Miroslav, 1993- The color of beech wood modified in air, paraffin or polyethylene glycol, and after following weathering in xenotest / Miroslav Repák, Ladislav Reinprecht. -- Graf., obr., tab. -- Lit. - The thermal treatment of European beech (Fagus sylvatica L.) wood specimens was performed in three different media – air, paraffin or polyethylene glycol 6000 (PEG 6000) – during 1, 2, 3 or 4 hours, applying either only heating at a temperature of 100 °C or modification process at the temperatures of 190 °C and 210 °C. Following, the thermally treated specimens were artificially weathered in Xenotest in an accordance with the modified EN 927-6 (2018) for 6-weeks. The color parameters L*, a*, and b* of beech specimens were measured in their original state, after thermal treatment, and finally after weathering. The total color difference DE*ab values of the air-thermally, paraffin-thermally and PEG- thermally modified beech specimens ranged from 23.6 (for air-thermal mode 190 °C/1h) up to 55.8 (for PEG-thermal mode 210 °C/4h), evidently in connection with their apparent darkening with DL* from – 22.9 up to – 54.2. Due to the following exposure of beech specimens in Xenotest, the highest total color difference DE*ab from 20.1 to 36.4 had the PEG-thermally modified ones, which evidently lightened with DL* from 18.6 to 32.6. At weathering the PEG-thermally modified beech wood specimens were the best resistant against creation of cracks in surfaces, in contrast to the air-thermally modified specimens.

In Acta Facultatis Xylologiae Zvolen : vedecký časopis Drevárskej fakulty. -- Zvolen : Technická univerzita vo Zvolene, 2021. -- ISSN 1336-3824. -- Vol. 63, no. 2 (2021), s. 55-71

I. Reinprecht, Ladislav, 1953-
II. Acta Facultatis Xylologiae Zvolen : vedecký časopis Drevárskej fakulty. -- Vol. 63, no. 2 (2021), s. 55-71

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