Abstract
House interior materials are not directly exposed to rain and only receive the sunlight that penetrates through window glass. Therefore, to develop a method of evaluating the photo-stability properties of interior materials, we applied the newly designed accelerated photo-stability test to wood and wood-finish materials separately under exposure to transmitted metal halide lamp light through window-sash glass and transmitted xenon lamp light through glass filter. The results are as follows :
When the light-colored softwood samples were exposed to the transmitted metal halide lamp light, L* values decreased, whereas a* and b* values increased. The degree of color changes decreased in the order of single glass, double glass, low emissivity double glass, solar reflection double glass, and laminated solar reflection double glass. Especially when exposed to the light through laminated solar reflection double glass and solar reflection double glass, a* and b* values decreased once at the first stage, and then increased gradually, and the color difference also increased, decreased and finally increased from the beginning to the final stage. Moreover, we have confirmed the influence of the different types of window glass on the photo-stability of the various wood-based house interior materials. These results have proven that the test methods using the transmitted metal halide lamp light are effective in the evaluation of the photo-stability properties of house interior materials which are exposed to transmitted light through window glasses.
