Comparison of the effects of accelerated aging with different lamps (UV-A and -B) on color and pendulum hardness properties of Russian olive wood treated with UV system varnish

In this study, some surface changes were investigated in Russian olive (Elaeagnus angustifolia L.) wood with UV system parquet varnish (3 and 5 layers) applied indoors, after exposure to artificial aging environments with different lamps. UV-A 340 and UV-B 313 type lamps were used in the aging application. Experimental samples were exposed to 252 hours of aging. In addition, tests of color parameters [(red color (a*) tone, yellow color (b*) tone and lightness (L*)] and pendulum hardness values were performed on aged and unaged varnish layers. According to the results of the research, statistical analysis of variance results were obtained for all tests in both varnish types and both lamp types. After the layers of both varnish types were exposed to 252 hours of aging of both lamp types, L* and b* values decreased while a* values increased. It was determined that the total color difference results of UV-B 313 lamps in both varnish types were higher than that of UV-A 340 lamps. Pendulum hardness values gave different results against different lamps.