Nickel-based alloys
Age-hardenable nickel alloys retain spring properties at high temperature and resist corrosive media.
Metal C Rings
Moss Seal supplies metal C-rings for service beyond what any elastomer can survive: cryogenic and extreme high temperature, high vacuum, aggressive media, radiation, and very high pressure. The C-shaped section acts as a spring, and the open side can be oriented toward system pressure so the ring is energised by the fluid it is sealing. We supply plated and coated variants matched to flange load, surface finish, and media.
ENGINEERING
Cross-section design & operation
A C-shaped metal section is compressed between flanges and acts as a spring, with a soft plating layer taking up flange surface imperfections.
Section design
Wall thickness and section diameter set the spring rate and the load needed to seat the ring. Silver, gold, PTFE, and nickel platings are selected to conform to the flange finish and to suit the operating environment.
How it works
Flange load compresses the section elastically, and the ring pushes back to maintain contact stress. When the opening faces system pressure, the fluid acts inside the C and forces the legs outward, so the seal energises as pressure rises.
Service limits
Metal C-rings operate where elastomers cannot, across cryogenic through high temperature service, in ultra-high vacuum, and in radiation or aggressive chemical environments that would degrade any polymer.
SELECTION
Materials & advantages
Performance advantages
Pressure-energised sealing · Cryogenic to high temperature · High-vacuum capable · Radiation tolerant · Resists aggressive media · Elastic spring-back
