This report presents the results of an exploratory experimental investigation to determine gasket factors under controlled conditions. Several asbestos composition gaskets and spiral wound gaskets were tested using a test procedure developed especially for this program. Variables considered were gasket width and thickness@ bolt load@ internal pressure and leakage rate. The tests were conducted using a pair of 4 in. ANSI B16.5@600 lb welding neck flanges with ideal flange face surfaces at ambient temperature. Two pressure media@ nitrogen and water@ were used to determine the difference in gasket factors for gas and for liquid containment. The tests cover a span of two years. Trends observed in m and y factors as a function of leakage rate@ gasket width@ media pressure@ and initial gasket stress are noted. Appropriate empirical equations were developed. Results are presented in both graphical and tabular form. The results also showed that the test procedure utilized is capable of determining the effect of controlling parameters on gasket behavior and yields reliable gasket performance data within its operating range. It is concluded that there exists a complex interaction between the controlling parameters and that recommendations of m and y factors for ASME Code adoption at this time would be premature. The need for a comprehensive test program to build on and quantify the observed trends is recognized.