Elevated temperature aged tests were performed on two fiber-reinforced sheet gasket materials with acrylonitrile-butadiene rubber (NBR) binder; a compressed asbestos and a compressed aramid. Weight loss, relaxation and cross-fiber tensile strength measurements were taken. An aging parameter (Ap) based on weight loss correlation is proposed which successfully groups data for different test times and temperatures. Ap is shown to have good potential as an accurate predictive parameter for determining long-term operating temperature on the basis of short-term tests. The use of the thermogravimetric approach is also discussed.

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