This European Standard specifies the gasket parameters required by EN 1591-1 and provides the test procedures for establishing the values of these parameters. Gaskets which are wholly based upon elastomers, or based upon elastomers with only the inclusion of particulate fillers or particulate reinforcement, as opposed to gaskets combining elastomers, fillers and fibrous reinforcement, are beyond the scope of this document. These test procedures contained can also be applied for other gasket types and dimensions, this must be indicated in the test report, however. The revision of the standard has become necessary since the experience collected during test methods carried out within the framework of the standard published in 2004 have been further refined. This European Standard has been prepared by Technical Committee CEN/TC 74 "Flanges and their joints", the secretariat of which is held by DIN (Germany). Regarding the German collaboration, the responsible committee is Working Committee NA 082-00-16 AA "Flansche und ihre Verbindungen" ("Flanges and their joints") at the Piping and Boiler Plant Standards Committee (NARD).