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In order to scientifically approach the design of mounting systems for substrates in emissions control systems, it is essential to characterize the behavior of the involved materials, particularly the support mat. Manufacturing processes and various in-field conditions impact the long term performance of the support mat, and life-long emissions performance is critically dependent on its ability to retain the substrate throughout the intended life. Therefore, to ensure product robustness, the behavior during operation of all available support mats must be appropriately characterized to determine the technical layout in specific applications. This paper addresses three common characterization tests, developed internally and externally. Additionally, equipment improvements to minimize artifacts in test results as well as the development of a new mat test for manufacturing methods are addressed.