Following extensive investigation of room temperature behavior of gaskets, interest is now focusing on their elevated temperature performance particularly since the many new materials now available are not as stable at elevated temperature as asbest's products.An elevated temperature tightness test machine developed by the authors has been successfully used on a number of gasket materials and results indicate that an elevated temperature test must be run over a period of days or weeks in order for the time/temperature effects to be meaningful.The objective was, therefore, to develop alternate test methods which would reduce the test time on the tightness test machine yet yield comparable results.