Fluorocarbon metal O rings and C rings are used for static sealing applications in extreme conditions and hostile environments where elastomer or polymer seals cannot be used.
They can withstand pressures from high vacuum to 700MPa and temperatures from cryogenic to 1000ºC (1832ºF).
Metal sealing rings are manufactured from hollow tubes or solid wire in a wide range of materials including various grades of Inconel® and stainless steel.
The rings are often plated or coated with soft materials such as gold, silver, nickel or PTFE, which bed into machining grooves to improve sealing performance.
Type FH Hollow Metal O Rings
Simple hollow metal O ring suitable for medium pressure and vacuum applications. Max pressure: 4MPa
Type FG Gas Filled Metal O Rings
Gas-filled metal O rings are hollow rings, gas-filled to give increased resilience at high temperatures above 430ºC (805ºF). Max pressure: 40MPa
Type FS Solid Metal O Rings
Solid metal O rings can be used in numerous applications where an economical metal ring is required. Max pressure: 4MPa
Type FA System Activated Metal O Rings
System activated O rings are hollow metal rings with small holes that allow the tube to be energised by system pressure. High pressure applications up to 700MPa
Type FC System Activated Metal C Rings
System-activated C rings are also pressure energised and used in medium to high-pressure applications up to 400MPa. They require lower compression loadings and provide higher spring-back than metal O rings
Type FE Spring Activated Metal C Rings
Spring-energised C rings are spring and system pressure activated. They offer exceptional spring-back, capable of compensating for expansion due to pressure and temperature cycling. Max pressure: 700MPa
Metal sealing rings are usually installed between flanges, located in either a groove or counterbore.
The groove depth is calculated to ensure the correct compression loading of the ring.
Alternatively, the ring can be installed between two flat flanges and located with a support plate. The thickness of the support plate is equal to the groove depth specified.