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A procedure for development of a simple, small-scale laboratory accelerated test based on the same light source used in the actual indoor application is described by Ketola et al.,  “Stress Analysis and Accelerated Test Design for Interior Light Environment” as part of this STP 1385. The test parameters identified in that work were used to evaluate and compare the durability of “inkjet” inks in both actual exposure and accelerated conditions. The inks were also exposed to more traditional weathering tests that may also be used to evaluate the light stability of materials used indoors. Test results point out the importance of matching the spectral power distribution of the real environment for obtaining the most accurate durability assessment. An approach for estimating service life for these inks is also described.
light, color, exposure testing, indoor, weathering, durability, service life
Division Scientist, 3M Weathering Resource Center, St. Paul, MN
Division Scientist, 3M Traffic Control Materials Division, St. Paul, MN