Abstract
The use of asbestos gaskets will be prohibited within one year. A variety of non-asbestos sheet gaskets have been developed, but the properties of non-asbestos gaskets at elevated temperatures have not yet been adequately described. In this study, a test method is proposed in which the existing JIS B 2490 "Test method for sealing behavior of gaskets for pipe flanges" is extended to include elevated temperatures. The sealing performance of two kinds of non-asbestos sheet gasket, i.e. the expanded PTFE sheet gasket and the non-asbestos compressed fiber sheet gasket, was evaluated using this new test method and the sealing performance of each non-asbestos sheet gasket at elevated temperatures was clarified. The proposed method proved effective in evaluating the sealing performance of non-asbestos sheet gaskets by testing for leaks at temperatures of over 100°C.
