Service Life Prediction and Numerical Weathering Test Methods

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Overview of Exposure Angle Considerations for Service Life Prediction This paper reviews selected considerations of exposure angle effect on materials weathering degradation. Calculation of solar angle of incidence is reviewed for surfaces with different slope angles. Historical UV irradiance measurement data is reviewed as a function of exposure angle. Weathering Test Methods Organizing the scope of weathering test methods into logical order helps the engineer visualize tools available for weathering tests. One order organizes exposures showing those with slowest rate of degradation on one extreme through the exposures showing the fastest rates of degradation on the opposite extreme. Variables, Methods and Philosophies Considered in Coatings Durability This presentation broadly overviews several key aspects of coatings weathering and durability. Recent empirical data is included to introduce some fundamental variables and environmental considerations being investigated.