BS EN 1514-3:1997- Flanges and their joints. Dimensions of gaskets for PN-designated flanges - Part 3. Non-metallic PTFE envelope gaskets
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This standard specifies the dimensions and marking of IBC (inside bolt circle) non-metallic envelope gaskets for use with flanges complying with EN 1092 Parts 1, 2, 3, 4, for PN 6 up to and including PN 63, up to and including DN 600.