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ONORM EN 12560-4:2001
Flanges and their joints - Gaskets for Class-designated flanges - Part 4: Corrugated, flat or grooved metallic and filled metallic gaskets for use with steel flanges (Austrian Standard)
The document specifies the dimensions and marking of IBC (inside bolt circle) corrugated, flat or grooved metallic and fillet metallic gaskets for use in conjunction with flanges complying with EN 1759-1 for Class 150, 300, 600, 900 and 1500 for nominal sizes DN 15 to DN 600, and for Class 2500 for nominal sizes DN 15 to DN 300.
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Austrian Standards Institute [on]