This standard specifies the dimensions and marking of IBC (inside bolt circle) PTFE non-metallic envelope gaskets for use with flanges complying with EN 1092 Parts: 1, 2, 3 and 4 for PN 6 up to and including PN 63, up to and including DN 600.
DS/EN 1514-3:1998 history
1998DS/EN 1514-3:1998 Flanges and their joints - Dimensions of gaskets for PN-designated flanges - Part 3: Non-metallic PTFE envelope gaskets