This European Standard specifies theconjunction with specific flange facingsdimensions and marking of metallic ring一oint gaskets(加e J) of flanges complying with prEN 1759-1:2000 forfor use inClass 150.Class 300, Class 600, Class 900 and Class 1 500 for nominal sizes DN 15 to DN 600, and for Class designation2 500 up to and including DN 300.