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A substrate is the supporting material onto which a washcoat and catalyst formulation are applied in a catalytic converter. Four different commercially available diesel exhaust purifiers were tested for durability and resistance to vibration. Each purifier contained a flow-through monolith substrate of different. design as well as the necessary packaging elements. A hot vibration test was used to evaluate each sample. This is an accelerated test that consists of passing hot exhaust gases through each purifier while oscillating it longitudinally on a test bench. Tests were conducted for 50 hours or until structural failure of the substrate. Diesel engines are commonly used in industrial equipment, exposing a catalytic converter in this application to a harsh environment. In practice, we have come across many cases where different substrate designs have failed under such difficult operating conditions.